You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, What kind of help are you expecting from our side?

USER: Ronald Lewis here.

ASSISTANT: Thanks for providing your name.

USER: Can you change my flight ticket reservation? I want to change my airport code on my ticketed flight.

ASSISTANT: Sure, I am here to help you out with that.

USER: Ok.

ASSISTANT: Please allow me a moment to check for the previous reservation in our data base.

USER: Sure.

ASSISTANT: We are sorry to say that, there is no active reservation found on your name.

USER: Not a problem.

ASSISTANT: Thanks for approaching us.

USER: Thank you.