You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help 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, may I know your name?

USER: Joseph Clark.

ASSISTANT: Wait a minute.

USER: Ok.

ASSISTANT: Sorry, we could not find any reservation on your name.

USER: No issue. Thank you.

ASSISTANT: Thank you for choosing us.