You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I be at your service today?

USER: I want to cancel my recent reservation. Could you help me with that?

ASSISTANT: Sure, to check your existing reservation please provide your name.

USER: Melissa Collins here.

ASSISTANT: Sorry, we don't have a reservation in your name.

USER: That's ok, no problem. Thank you.

ASSISTANT: Thank you.