You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am John Roberts, want to cancel my recent reservation. Please help me with that.

ASSISTANT: Ok, please wait for a minute.

USER: Sure.

ASSISTANT: Sorry John, no reservation found on your name in our database.

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

ASSISTANT: Thank you for reaching us.

USER: Welcome.