You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

USER: I am William Thompson. Owing to an emergency I want to cancel my reservation, can you help me?

ASSISTANT: Sure, I am here to help you with this.

USER: Thank you.

ASSISTANT: There is a reservation found under your name, shall I cancel it?

USER: Yes, please.

ASSISTANT: Your reservation has been cancelled successfully.

USER: Thank you for your help.

ASSISTANT: You are welcome.