You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I support you today?

USER: Due to some emergency I need to change my existing reservation can you help me with the changes?

ASSISTANT: Sure, may I know your good name?

USER: I am John Davis.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry to say that, no reservation was found with your good name.

USER: No problem. Thank you for the information.

ASSISTANT: Thank you for reaching us.