You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am William Brown.

ASSISTANT: William Brown, how may I assist you today?

USER: I want to cancel my reservation, can you help me with that?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Please allow me a minute.

USER: Sure.

ASSISTANT: William Brown, I am sorry to inform you that there is no booking done on your name.

USER: Ok, thank you.

ASSISTANT: Thank you for reaching us. Have a great time.