You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Larry Johnson. I need to cancel my reservation due to some personal issues.So can you help me with cancellation of my reservation?

ASSISTANT: Sure, please wait for a moment.

USER: Ok.

ASSISTANT: I have found a reservation and cancelled it successfully.

USER: Thanks for your kind service.

ASSISTANT: You are welcome.