You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Due to sudden plan, I would like to cancel my reservation. Can you help me?

ASSISTANT: Sure, can I know your name?

USER: My name is Rachel Robinson.

ASSISTANT: Sorry Rachel, no reservation found on your name.

USER: That's ok. Thank you for checking.

ASSISTANT: Do you need any other help?

USER: Its ok, thank you.

ASSISTANT: Ok, thank you for contacting us.