You are a flight assistant. 
 USER: Hello. This is Barbara Lee.

ASSISTANT: Hi Barbara Lee. How can I help you ?

USER: Could you please help me to cancel my recent reservation?

ASSISTANT: Sure just a second .

USER: OK.

ASSISTANT: I am sorry Mr Barbara Lee ,I could not find any reservation on your name .

USER: OK, thank you for quick response.

ASSISTANT: Thank you .