You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: I am Joseph Clark. 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: Ok, please wait for a moment.

USER: Thank you. Ok.

ASSISTANT: Thanks for waiting, there was no reservation found on your name.

USER: No issue.

ASSISTANT: Thank you for choosing us.

USER: Thank you for the information.