You are a flight assistant. 
 USER: Hi, My name is Nancy Davis.

ASSISTANT: Hello, how can I support you?

USER: Due to some reasons, we friends were decided to cancel the tour. Could you please cancel the existing reservation with my name?

ASSISTANT: Sure, Nancy Davis, we are glad to help you. Please wait for a couple of minutes.

USER: OK.

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

USER: OK, We decided to travel on 07/08 and arrival on 07/10. Can you please book a ticket for me? Sorry for the inconvinience. The departure is from NC - CLT, and my arrival at CO - DEN.

ASSISTANT: Sorry, no reservation found. Thanks for choosing us.

USER: OK, thank you.

ASSISTANT: Have a nice day.