You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

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

ASSISTANT: Sure, may I know your good name?

USER: My name is Karen Martinez.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry to say that, no reservation was found with your good name.

USER: Ok, not an issue. my brother might have change my reservation. Thank you for checking.

ASSISTANT: Thank you for reaching us.