You are a flight assistant. 
 USER: Hi, I am Catherine walker.

ASSISTANT: Hello. How may I be of your assistance?

USER: Owing an emergence, I want to cancel my recent reservation. Can you please help me with it?

ASSISTANT: Sure, I'll help you in cancellation. Please wait a moment.

USER: Ok.

ASSISTANT: Thank you for waiting, there is no reservation found by this name.

USER: Ok, no issues. Thanks for the help.

ASSISTANT: Thank you for opting us.