You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

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

ASSISTANT: Sure, I'm glad to help you with that. May I know your good name please?

USER: My name is Deborah Campbell.

ASSISTANT: Ok, please wait while I'll check your reservation status.

USER: Sure, I will wait for your information.

ASSISTANT: Deborah Campbell, there is no active reservation found under your name to do modifications in that.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for choosing us, have a nice day.