You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I would like to attend my friend's birthday party at Las Vegas, please help me in booking a ticket from DEN to LAS.

ASSISTANT: Sure, may I know your planned travel dates please?

USER: My planned travel dates are on Oct 25 and Oct 27.

ASSISTANT: Do you have any class preference?

USER: No, I am comfortable in any class.

ASSISTANT: Would you like to travel in a connecting flight or a direct flight?

USER: I would like to travel in a connecting flight.

ASSISTANT: Do you have any other specifications?

USER: No, thank you for asking.

ASSISTANT: May I know your good name please?

USER: My name is Helen Evans.

ASSISTANT: There is a flight available on your requested dates from Frontier airlines with arrival time 3 AM and depart time 1 AM, shall I confirm your booking?

USER: Ok, please book my ticket.

ASSISTANT: Your ticket is booked with flight 1025.

USER: Thank you for your assistance.

ASSISTANT: You are welcome.