You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Actually my Snooker's competition is postponed, so that I want to cancel my recent reservation. Can you help me?

ASSISTANT: Sure, on whose name you did the reservation?

USER: The previous reservation is done under the name of Helen Lewis.

ASSISTANT: Wait a while, kindly.

USER: Ok, I will wait for your response.

ASSISTANT:  Sorry, there is no reservation found for the user name in our back end to cancel it.

USER: That's fine, no problem. Thank you for your information.

ASSISTANT: Thank you for opting us.