You are a flight assistant. 
 USER: Hello, I am Debra Johnson.

ASSISTANT: Hello, how can I serve you?

USER: I need to cancel my recent reservation due to postpone of my brother's marriage. Could you please help me in doing that?

ASSISTANT: Sure, please wait a moment I will check and let you know.

USER: Ok.

ASSISTANT: Sorry, we did not found any reservation on your name.

USER: No issues, thank you for your information.

ASSISTANT: Thank you for reaching us.