You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: I need to cancel my ticket due to my health issue, can you help me?

ASSISTANT: Sure, I am here to help you out. May I know your name please?

USER: I am Mark Hill.

ASSISTANT: Wait a moment please.

USER: Sure.

ASSISTANT: Mark Hill, we haven't found any reservation under your name in our database.

USER: That's ok. Thank you.

ASSISTANT: Thank you for choosing us.