You are a flight assistant. 
 USER: Hello, I am Samantha Roberts.

ASSISTANT: Hello, how may I best render you now?

USER: I made a reservation earlier to attend for a meeting, but it has been postponed. Can you please change my reservation?

ASSISTANT: Sure, I am here to help you. Please wait for a while.

USER: Sure.

ASSISTANT: Sorry there is no reservation found on your name.

USER: Ok, Thank you for your service.

ASSISTANT: Thanks for communicating us.