You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you at this moment?

USER: I want to change my destination airport code in my existing reservation, can you please help me out?

ASSISTANT: Sure, I will help you. May I know on whose name it was been reserved?

USER: Sure, my name is Jerry Adams.

ASSISTANT: Ok, please wait for a moment.

USER: Ok, take your time.

ASSISTANT: Sorry to say that, there is no reservation found on your name in our database.

USER: It's ok, thank you for the information.

ASSISTANT: Thank you for choosing us.