You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Owing an emergency, I want to cancel my reservation.

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Can you please tell me your name?

USER: My name is Donald Hill.

ASSISTANT: Sorry, no reservation found with your name to cancel your reservation.

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

ASSISTANT: Welcome.