You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Timothy Garcia.

ASSISTANT: How may I serve you at this moment?

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: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please wait for some time.

USER: Ok. Ok.

ASSISTANT: There is no existing reservation found on your name in our records.

USER: No issue.

ASSISTANT: Thank you for reaching us.

USER: Thank  you.