You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

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

ASSISTANT: Sure, could you please help us with your name?

USER: Sure, my name is John Johnson.

ASSISTANT: Thank you. Please wait, I will check your reservation status and let you know.

USER: Ok, take your time.

ASSISTANT: I am sorry, there is no reservation found under your name in our database.

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

ASSISTANT: You are most welcome and thank you for choosing us.