You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER:  I have to change my travel airport codes because I have given a airport code which is far to my current location. So, I need your help. Will you please help me in changing the details?

ASSISTANT: Yes, I would be glad to help you for the change of flight ticket reservation.

USER: Thank you.

ASSISTANT: Please may I know on which name the flight ticket has been reserved?

USER: Margaret Wright.

ASSISTANT: Please wait for a moment. I will check your flight reservation status and let you know.

USER: Sure.

ASSISTANT: Thanks for waiting.

USER: It's ok.

ASSISTANT: Sorry I have not found your flight reservation to change it.

USER: That's ok. Thank you for your service.

ASSISTANT: Thank you.