You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER:  I am Larry Jackson want to cancel my reservation due to prepone of my meeting.

ASSISTANT: Ok.

USER:  Can you please cancel it?

ASSISTANT: Sure, please give me a minute.

USER: Ok.

ASSISTANT: Sorry Larry, there is no reservation available on your name.

USER: Thank you for your response.

ASSISTANT: You are welcome.