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

ASSISTANT: Hello, How can I assist you?

USER: As my sister's baby shower program has been postponed, can you please change my reservation?

ASSISTANT: Sure, Please wait a second.

USER: Sure.

ASSISTANT: Sorry, No reservation found on your name.

USER: Ok. Thank you.

ASSISTANT: Thank you for opting us.