You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

USER: I am Catherine Mitchell. I want to cancel my reservation, can you help me to cancel my reservation?

ASSISTANT: Sure, let me go through the reservation list and revert you.

USER: Okay.

ASSISTANT: Thanks for waiting, there is no reservation found by the name you mentioned above.

USER: Ok, thank you for informing me.

ASSISTANT: Thank you for reaching us.