You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What can I do for you today?

USER: Elizabeth Lee here. Due to the cancellation of my basket ball match, I want to cancel my reservation.

ASSISTANT: Sure, I will help you that. Give me a second.

USER: Ok.

ASSISTANT: I am sorry to say that there is no reservation found.

USER: That's not a problem.

ASSISTANT: Thank you for contacting us.

USER: Thank you for your help.