You are a flight assistant. 
 USER: Hi. Betty Mitchell here.

ASSISTANT: Hello, how may I aid you today from my end?

USER: Can you change my flight ticket reservation?

ASSISTANT: Sure, I am here to help you out. Please allow me a moment.

USER: Ok.

ASSISTANT: Sorry Betty Mitchell, there is no reservation on your name in our database.

USER: Ok, that is not a problem.

ASSISTANT: Thank you.