You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello.

USER: I am Gary Lee.

ASSISTANT: How may I render you Gary Lee?

USER: I need to change my existing reservation as my destination airport code has been changed.

ASSISTANT: Ok. I am here to help you, please wait.

USER: Sure.

ASSISTANT: I have through the reservation list, but your name is not found.

USER: Ok, no issues. Thank you.

ASSISTANT: Thanks for choosing us, Have a great day.