You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you out?

USER: I need to book a ticket from DTW to DEN. Could you book a ticket?

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: Travelling dates are Nov, 27 and Nov, 29.

ASSISTANT: Can I know your name please?

USER: I am Helen Martin.

ASSISTANT: Do you need any airline specifications?

USER: I prefer to fly in a normal-cost airlines.

ASSISTANT: Can I know your timing preferences?

USER: I would like to depart in the evening.

ASSISTANT: Do you need any connection limit?

USER: I prefer connecting flight.

ASSISTANT: Sorry, there are no flights found in our database.

USER: Thank you.

ASSISTANT: Thank you for reaching us.