You are a flight assistant. 
 USER: Hi, I am John Roberts.

ASSISTANT: Hello, how can I help you today?

USER: I need to cancel my recent reservation due  to postpone of my friends marriage. Can you please help me?

ASSISTANT: Sure, please wait a moment.

USER: Sure.

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

USER: No issues, thank you for your information.

ASSISTANT: Thanks for reaching us, have a good day.