You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I help you?

USER: I have reserved a ticket to meet my friend but suddenly it got postponed. So please help me with changing my reservation.

ASSISTANT: Sure, May I know your name?

USER: My name is Sarah Williams.

ASSISTANT: Please wait a second.

USER: Sure.

ASSISTANT: Sorry, No reservation found on your name.

USER: No problem, thank you for the checking.

ASSISTANT: Thank you for opting us.