You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Due to the reason that my friend met with an accident, I want to cancel the recent reservation. With the name of Lisa Roberts.

ASSISTANT: Sure, we will help you. Please wait for a couple of minutes.

USER: Ok.

ASSISTANT: Thanks for your patience. Sorry, we did not find any reservation based on your name.

USER: Ok, thank you for your information.

ASSISTANT: Ok, Thanks for availing our service.