You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

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

ASSISTANT: Sure, I can help you and may I know your name for checking purpose?

USER: I am Christopher Wilson.

ASSISTANT: Please allow me a moment.

USER: Sure.

ASSISTANT: There is no reservation found for the user name in our back to cancel your booking.

USER: No problem, thank you for the information.

ASSISTANT: You are most welcome and thank you for reaching us.