You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I render you?

USER: I have a reservation to attend a get together party. Due to some issue it has been postponed. Can you please change my existing reservation?

ASSISTANT: Sure, I will help yu. May I know your name to change your reservation?

USER: I made a reservation earlier on the name of Mary Martinez.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

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

USER: No problem, thanks for your quick response.

ASSISTANT: Thank you for opting us.