You are a flight assistant. 
 USER: Hi, I am Anna Allen.

ASSISTANT: Hello, how can I assist you today?

USER: Owing to an emergency I need to cancel my recent reservation. Can you help  me in cancellation?

ASSISTANT: Sure, please wait for a moment. Sorry to say that, no reservation found with your name.

USER: Ok. No problem. Thanks for your help.

ASSISTANT: Ok, thank you for choosing us.