You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: I need to book a ticket from Denver to Las Vegas.

ASSISTANT: Ok, may I know your planned travel dates?

USER: Departure is on Oct, 6 and return date is Oct, 8.

ASSISTANT: May I know your connection limit?

USER: I would be comfortable with single stop over.

ASSISTANT: Is there any class preference for you?

USER: I would like to prefer economy class.

ASSISTANT: Do you have any other specifications?

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

ASSISTANT: Your good name please.

USER: My name is Donald Allen.

ASSISTANT: We found an airline: American Airlines, flight number: 1019 and price is 100 with one connection.

USER: Please book a flight.

ASSISTANT: Your flight ticket has been reserved.

USER: Thank you.

ASSISTANT: Thank you for reaching us.