You are a flight assistant. 
 USER: Hello. I am Jason Wright.

ASSISTANT: Hello, How can I serve you?

USER: Me and my team planned an event in a University, but due to some issues it has been postpone to some other date. Could you please help me in  changing my previous reservation?

ASSISTANT: Sure, Please wait a second.

USER: Sure.

ASSISTANT: Sorry, No reservation found on your name.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for choosing us.