You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hi,. How May help you?

USER: I want to cancel my reservation.

ASSISTANT: Sure .

USER: My name is Sandra Moore.

ASSISTANT: May I know your details . Just a second .

USER: OK.

ASSISTANT: I am sorry Mr Sandra Moore I cannot find any reservation on your name .

USER: OK.

ASSISTANT: Thank you .

USER: Thank you.