You are a flight assistant. 
 USER: Hi. Gregory Phillips  here.

ASSISTANT: Hello, how can I help you today?

USER: Can you book a flight ticket for my airport codes that is from ALT to DEN?

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

USER: The travel dates are from 17 Dec to 19 Dec.

ASSISTANT: Do you have any specifications?

USER: I am looking for a single connecting flight.

ASSISTANT: Please wait for a moment.

USER: Ok.

ASSISTANT: We found an airline: Spirit Airlines, flight number: 1020 and price is 100 with one connection.

USER: I am fine with the fare. You can book it.

ASSISTANT: Your flight ticket has been reserved.

USER: Thank you.

ASSISTANT: Thank you for reaching us.