You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I have an emergency meeting in my office so, please cancel my reservation that I made earlier to go for film festival.

ASSISTANT: Ok, I can help you to cancel. Provide me your name?

USER: Thank you. I am Alexander Green.

ASSISTANT: Sorry, no reservation has been registered with us. Thanks for opting us.

USER: Ok, thank you for the response.