You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you today?

USER: I am having sudden meeting in my office, can you please help me changing my reservation?

ASSISTANT: Sure, may I know your name to check the reservation details?

USER: Ok, my name is Margaret Davis.

ASSISTANT: Sorry, I could not find any reservation with your name in our database.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: My pleasure.