You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I assist you?

USER: I want to cancel my recent reservation which is with the name Melissa Hill. Can you help me with it?

ASSISTANT: Sure, let me check and get back to you.

USER: OK.

ASSISTANT: Sorry, no reservation found in a provided name.

USER: OK, thank you.

ASSISTANT: your welcome, thanks for choosing us.