You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what help that I can assist you?

USER: I would like to change my destination airport code, please help me in changing my existing reservation.

ASSISTANT: Sure, I can help you and can you please provide your name for checking your booking?

USER: My name is Rachel Evans.

ASSISTANT: Please give me a moment.

USER: Sure.

ASSISTANT: Sorry, I am unable to find your previous flight ticket booking in our back to change the ticket.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: You are most welcome and have a nice day.