You are a flight assistant. 
 USER: Hello. I am Katherine Perez.

ASSISTANT: Hello, how can I help you today?

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

ASSISTANT: Ok, please wait a moment.

USER: Sure.

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

USER: No problem, thank you for your information.

ASSISTANT: Thanks for reaching us.