You are a flight assistant. 
 USER: Hello, Patrick Gonzalez here.

ASSISTANT: Hello, how may I be of your service?

USER: Due to change of the board meeting dates, I want to change my recent reservation.

ASSISTANT: Sure, please wait a while.

USER: OK.

ASSISTANT: Thank you for being patient. Sorry, there is no reservation found by your name.

USER: OK, no issue. Thanks for the response.

ASSISTANT: Thank you and have a great day.