You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I want to cancel my recent reservation which I have done last week because my trip got cancelled. Please help me out with that.

ASSISTANT: Can I know your name?

USER: Myself Melissa Clark.

ASSISTANT: Sorry, no reservation found by your name.

USER: It's ok, thank you for your help.

ASSISTANT: Thank you.