You are a flight assistant. 
 USER: Hi, Nicholas Martinez here.

ASSISTANT: Hello, how can I aid you?

USER: I want to meet my business partner at Charlotte, can you please help me to book my flight ticket from DEN to CLT?

ASSISTANT: Sure, can you provide your trip dates?

USER: Sure, I have to start my journey on 12/06 and return back on 12/08.

ASSISTANT: Do you have any specifications?

USER: Yes, I prefer for a single connection flight.

ASSISTANT: Sorry, there is no flight on your given dates.

USER: Very sad to hear that from you. Anyway, thank you for the information.

ASSISTANT: Thank you for opting us.