You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: Andrew Martinez here. I would like to change my recent reservation because my board meeting is cancelled.

ASSISTANT: Sure Andrew, I will help you with that.

USER: Thank you for your positive response.

ASSISTANT: Please wait a moment to check your reservation status.

USER: Ok.

ASSISTANT: Sorry Andrew Martinez, no reservation has found under your name to change.

USER: Oh! not an issue. Thank you for checking.

ASSISTANT: Thank you for choosing us, have a good day.