You are a flight assistant. 
 USER: Hello. I am Brandon Green.

ASSISTANT: Hello, how can I guide you today?

USER: I made a reservation earlier to attend a meeting in Houston but, due to some problems with clients meeting venue got changed to Los Angeles. So, I want you to please change my existing reservation.

ASSISTANT: Sure, I am ravish to help you.

USER: Thank you.

ASSISTANT: Please wait for sometime to check the status of your reservation.

USER: Thank you for informing me.

ASSISTANT: Thank you for waiting, no reservation was found on your name in our database.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for opting us. Have a nice day.