You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: Due to modifying my recent trip, I need to cancel my previous flight reservation. Can you please aid me in that.

ASSISTANT: Sure, may I know your name to check for the previous reservation?

USER: I am Sandra Mitchell.

ASSISTANT: Please allow me a moment.

USER: Sure.

ASSISTANT: There is no reservation found under your name.

USER: Ok, not an issue. Thanks for your service.

ASSISTANT: Thank you for contacting us.