You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

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

ASSISTANT: Please can I know your name to change the reservation?

USER: Sure, my name is Debra Jones.

ASSISTANT: Ok, please wait a moment.

USER: Ok, take your time.

ASSISTANT: Sorry, there is no reservation been found on your name to change.

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

ASSISTANT: Thank you for choosing our agency.