You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What else can I assist you today?

USER: Owing to an emergency, I want to cancel my reservation. Can you help me out?

ASSISTANT: Sure, I will help you to cancel that reservation, but I need your name to check the details?

USER: Sure, my name is Donna Brown.

ASSISTANT: Sorry Donna, we cannot find any reservation with your name in our database.

USER: That's fine, thank you for the information.

ASSISTANT: Do you want any more information from us?

USER: No, thanks for your service.

ASSISTANT: It's my pleasure, have a great day.