You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you today?

USER: I would like to change my existing reservation due to postpone of my seminar. Can you please help me?

ASSISTANT: Sure, I am here to help you to change it. Can I have your name please?

USER: I am Jessica Evans.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thanks for your time, we did not found any reservation on your name to change it.

USER: No worries, thank you for the information.

ASSISTANT: Thank you for availing us.