You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can.

USER: My name is Roberts Smith.

ASSISTANT: How can I help you today?

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

ASSISTANT: Sure, I will help you to cancel your reservation.

USER: Thank you.

ASSISTANT: Sorry, I didn't find any reservation on your name to cancel.

USER: That's ok, thank you for checking.

ASSISTANT: Welcome, have a nice day.