You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

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

ASSISTANT: Sure, may I know your good name please?

USER: Sure, I have made my reservation on the name Sandra Hill.

ASSISTANT: OK, please wait a minute.

USER: Ok.

ASSISTANT: Unfortunately there is no reservation found by your name.

USER: No worries, thank you for your information.

ASSISTANT: Thank you for choosing us.