You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Can you help me to book a flight ticket from DEN to PHL?

ASSISTANT: May I know your planned travel dates?

USER: Ok, please book a flight ticket for the dates Dec 28 and Dec 30th respectively.

ASSISTANT: Is there any class preference for you?

USER: No.

ASSISTANT: May I know your connection limit?

USER: Yes, I need a direct flight.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: Your good name please.

USER: Please book a ticket on the name Sandra Williams.

ASSISTANT: We found an airline: Spirit, flight number: 1003 and price is 100 with one connection.

USER: Please go ahead with the booking.

ASSISTANT: Your flight ticket has been reserved.

USER: Thank you for assisting me.

ASSISTANT: Thank you.