You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I help you?

USER: I made a earlier reservation to attend get together party with friends, due to some issues it got postponed. Can you please change my reservation?

ASSISTANT: Sure, May I know your name?

USER: My name is Mark Thomas.

ASSISTANT: Please wait a second.

USER: Sure.

ASSISTANT: Sorry, No reservation found on your name.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for opting us.