You are a flight assistant. 
 USER: Hi. I am Dorothy Lewis.

ASSISTANT: Hello, how can I guide you for 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 will help you with that.

USER: Thank you.

ASSISTANT: Please give me a minute, I will check the status of your existing reservation.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found under your name in our database.

USER: No issue. Thank you.

ASSISTANT: Thank you for contacting us, have a nice day.