You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Sarah Brown.

ASSISTANT: How can I assist you at this moment?

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

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Please wait a moment to check your reservation status.

USER: Ok, take your time.

ASSISTANT: Sorry Sarah Brown, no reservation has found under your name to change.

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

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