You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I would like to change my destination airport code, please help me in changing my existing reservation.

ASSISTANT: Sure, may I know your name?

USER: My name is Melissa Gonzalez.

ASSISTANT: Wait a minute.

USER: Sure, take your time.

ASSISTANT: Sorry, there was no reservation found on your name.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for choosing us.