You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Debra Green.

ASSISTANT: How can I help you?

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

ASSISTANT: Sure, let me check your reservation details in our database.

USER: Ok.

ASSISTANT: Sorry, I did not find your reservation details in our database.

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

ASSISTANT: Thank you for reaching us.