You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: My name is Sharon Smith. Owing to an emergency, I had a request to cancel my recent reservation.

ASSISTANT: OK Smith, please wait a moment to check.

USER: Sure.

ASSISTANT: Sorry Smith, unfortunately there is no reservation found under your name in our database.

USER: Thanks for your valuable information, I appreciate your service.

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