You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello,. How can I assist you today?

USER: I want to cancel my recent reservation as my plan to attend sports festival got postponed. Please help me with cancellation.

ASSISTANT: May I know your name for cancellation process.

USER: I am David Clark.

ASSISTANT: There is no reservation found with your name for cancellation. Thank you for opting us.

USER: That's fine, thank you.