You are a flight assistant. 
 USER: Hello. I am Donna Nelson.

ASSISTANT: Hello. How can I help you?

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

ASSISTANT: Wait for a minute.

USER: Sure.

ASSISTANT: Sorry, no reservation found by your name.

USER: No problem, thank you for the information.

ASSISTANT: Thank you.