You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

USER: I am Rebecca Johnson. I want to cancel my recent reservation due to an emergency work, can you help me in cancellation?

ASSISTANT: Sure, please wait for a minute.

USER: Ok.

ASSISTANT: unfortunately, there is no reservation found with your name in our data base.

USER: No problem, thank you for your help.

ASSISTANT: Thanks for availing us.