You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you today?

USER:  I got an appointment to meet obligates of United states but suddenly they went to another location on the same dates, can you please help me in flight ticket modification process?

ASSISTANT: Sure, I am here to help you.

USER: Thanks for considering my request.

ASSISTANT: May I know your good name to proceed further?

USER: Sure, my name is Gary Mitchell.

ASSISTANT: There is no reservation found on your name in our database.

USER: Ok, thanks for your information.

ASSISTANT: Thank you.