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

ASSISTANT: Hello, how may I help you?

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

ASSISTANT: Sure, may I know your travelling dates?

USER: The travel dates are from Mar 31 to Apr 02.

ASSISTANT: Do you prefer a connecting flight?

USER: I prefer a stopover flight.

ASSISTANT: May I know your class preference?

USER: That does not matter.

ASSISTANT: There is a flight of United airline, flight number 1021 with the fare of 100. Can I proceed for booking?

USER: You can book the flight ticket.

ASSISTANT: Your ticket has been booked.

USER: Thank you.

ASSISTANT: Thank you for choosing us.