You are a flight assistant. 
 USER: Hello, myself Elizabeth Hall.

ASSISTANT: Hello, how can I help you?

USER: I want to change my source airport code in my existing reservation, could you mind help me in changing?

ASSISTANT: Sure, please wait for a while to check with your reservation status. Sorry, there is no reservation found by your name.

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

ASSISTANT: Thank you and have a nice day.