You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: Can you help me in modification of my reservation as I am not feeling well?

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

USER: Thank you for your concern. My name is Gary Mitchell.

ASSISTANT: Wait a moment please.

USER: Sure.

ASSISTANT: Gary Mitchell, we haven't found any reservation under your name in our database to change.

USER: Oh! Sad to hear, anyways thank you for the information.

ASSISTANT: Thank you for choosing us.