You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am John Carter.

ASSISTANT: How can I aid 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: Sure, I am here to help you with that.

USER: Thank you.

ASSISTANT: Please, give me a moment to check your reservation status.

USER: Ok.

ASSISTANT: Sorry, we did not found any reservation on your name in our database.

USER: No issue. Thank you.