You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: Can you cancel my reservation which was booked last week?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Can you please mention your name to check further in our database?

USER: My name is Dennis Roberts.

ASSISTANT: Please stand by.

USER: Sure.

ASSISTANT: Sorry, no reservation found on your given name in our database to cancel it.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for contacting us.