You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I am Carol Williams.

ASSISTANT: Nice to meet you.

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

ASSISTANT: Sure, I can help you with that. Please wait for a while.

USER: Sure.

ASSISTANT: Carol Williams, there is no reservation found under your name in our database to do cancellation.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for choosing us, have a great day.