You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

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

ASSISTANT: Sure, can I have your name please?

USER: Sure, my name is Gregory Phillips.

ASSISTANT: Ok, please wait for a while.

USER: Ok, take your time.

ASSISTANT: Thanks for waiting, there is no active reservation on your given name.

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

ASSISTANT: Thank you for reaching us.