You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I want to modify my destination airport code because the place where I have to go is not near to that destination airport. Can you please help me to change the details?

ASSISTANT: Sure,I will help you with that.

USER: Thank you for considering my request.

ASSISTANT: May I know your name please.

USER: My name is Christopher Adams.

ASSISTANT: Sorry, there is no reservation on your name in our database.

USER: It's ok, not a problem with that. Anyways thank you for your time.

ASSISTANT: Thank you for reaching us.

USER: You are most welcome.