You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Alexander Wilson.

ASSISTANT: How may I help 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 with that.

USER: Thank you.

ASSISTANT: Please wait for a minute.

USER: Ok.

ASSISTANT: We are regret to inform you that, there is no reservation found on your name in our database.

USER: No issue. Thank you.

ASSISTANT: Thank you for approaching us.