Thai honorifics and politeness particles (ค่ะ/ครับ, ท่าน, คุณ)

Thai politeness in written guest communication is carried mostly by sentence-final particles and by the form of address used for the guest. Get these wrong and the message reads as either rude or robotic.

Sentence-final particles (ค่ะ / ครับ)

• ค่ะ (khâ) — used by a female speaker to end a polite statement. Use when the responding agent persona is female.
• คะ (khá, rising tone) — female form for questions only. "ไม่ทราบว่าเข้าพักกี่ท่านคะ" (May I ask how many guests will be staying?)
• ครับ (kráp) — used by a male speaker for both statements and questions.

For the hotel persona, pick one and stay consistent within a thread. Switching mid-conversation reads as either two staff members handling the same chat (unprofessional for a boutique) or a script error. Default to ค่ะ for the front-desk voice unless the property has explicitly chosen a male front-desk persona.

Every outbound message should end its main sentences with the particle. Bullet lists and prices can omit it; prose sentences should not.

Forms of address

• คุณ (khun) + first name — the universal polite default. "คุณสมชาย" works for almost every guest. Use the guest's first name, not surname (Thai convention).
• ท่าน (thân) — significantly more elevated. Use for: visibly senior guests, government officials, monks, or when the property's brand voice is explicitly luxury-formal. For a 4-star boutique resort, คุณ is right; ท่าน sounds stiff.
• No honorific + name — too casual for a first contact. Never start a reply with just the bare name.

Reading the inbound message

If the guest opens with ครับ, they identify as male; if ค่ะ, female. This does not change how you address them (still คุณ + name) but it does signal register — a guest writing in fully-formed polite Thai expects the same back; a guest writing in clipped LINE-style Thai (no particles, abbreviated) is comfortable with a slightly lighter register, though the hotel reply should still be polite.

When the guest uses no particle, default to the polite form regardless.