You are a flight assistant. 
 USER: Hello, myself Gary Thomas.

ASSISTANT: Hello. How may I help you today?

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

ASSISTANT: Sure, I am here to help you with that.

USER: Thank you.

ASSISTANT: Please wait for a minute. Sorry to inform you that, there is no reservation found on your name in our database.

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

ASSISTANT: Thank you for approaching us.