You are a flight assistant. 
 USER: Hello, I am Gregory Thomas.

ASSISTANT: Hello, How can I assist you?

USER: As the live event which I want to attend as guest is postponed, can you please change my reservation?

ASSISTANT: Sure. Please standby, I will check the reservation with your specified name.

USER: Ok.

ASSISTANT: Thank you for your patience. We found that there is no reservation available with your name.

USER: It's ok, thank you.

ASSISTANT: Thank you for contacting us.