You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I aid you today?

USER: I need to cancel my recent reservation due to sudden changes in the summit which was going to be held in the place.

ASSISTANT: Sure, we are gladly here at your service.

USER: Can you please help me with cancellation?

ASSISTANT: Sure, can you please share your name to proceed?

USER: I had a recent reservation with name David Lopez.

ASSISTANT: Ok, please hold a moment, let me check your reservation.

USER: Ok.

ASSISTANT: Thanks for your time, sorry, unfortunately no reservation found with provided name.

USER: Ok, no worries at all. Thank you for your information.

ASSISTANT: Thank you for picking us, have a pleasant day.