You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I made a earlier reservation to attend my friend marriage, due to some financial problems it got postponed. Can you please change my existing reservation?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: May I know your name to check the reservation list?

USER: Sure, my name is Samuel Young.

ASSISTANT: Sorry Samuel Young, there is no active reservation on your name.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you.