You are a flight assistant. 
 USER: Hello. I am Cynthia Adams.

ASSISTANT: Hello, how may I help you today?

USER: I would like to meet my grand parents at Las Vegas, can you help me to book a flight ticket from DEN to LAS?

ASSISTANT: Sure, may I know your planned trip dates?

USER: My preferable journey dates are Sept 06 and Sept 08.

ASSISTANT: Do you have any connection limit?

USER: Yes, I prefer connecting flight.

ASSISTANT: Which class do you prefer either economy or business?

USER: I prefer business class.

ASSISTANT: Do you have any depart and arrival timings?

USER: I would like to depart in the evening.

ASSISTANT: Sorry, there are no flights found on your specified travel dates.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for availing us.