You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

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: I have understood your concern, I will help you. Please help me with your name to find your booking details.

USER: Steven Evans.

ASSISTANT: Please allow me a minute.

USER: Ok.

ASSISTANT: Steven Evans, I am really sorry to inform you that there is no booking found on your name.

USER: Ok, no problem in that. Thank you.

ASSISTANT: Thank you for reaching us. Have a great time!.