You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I would like you to change my flight reservation as I am unwell. Can you please help me?

ASSISTANT: Sure, may I know your name for the changing process?

USER: Thank you. I am Daniel Brown.

ASSISTANT: Wait a while, kindly.

USER: Sure.

ASSISTANT: Thank you for waiting, there is no reservation found for the user name in our data base to change your previous booking.

USER: Sad to hear that. Anyway, thank you for checking.

ASSISTANT: Thank you for reaching us.