You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you today?

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 with that.

USER: Thank you.

ASSISTANT: May I know your name please?

USER: Sure, my name is Nicholas Taylor.

ASSISTANT: I am sorry to say that there is no reservation found under your details.

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

ASSISTANT: Thank you for reaching us.