You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

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

ASSISTANT: Sure, may I know your good name?

USER: My name is Dennis Parker.

ASSISTANT: Please wait for a moment.

USER: Sure, take your time.

ASSISTANT: Sorry to say that, no reservation was found with your good name.

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

ASSISTANT: Thank you for reaching us.