You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Please help me to book a flight ticket from DCA to LGA.

ASSISTANT: Sure, may I know your name?

USER: Mary Moore.

ASSISTANT: Can I know your travelling dates?

USER: My journey dates are from Apr, 24 to Apr, 26.

ASSISTANT: Do you have any other preferences?

USER: I need a single connecting flight.

ASSISTANT: Wait a minute.

USER: I prefer to depart in the afternoon.

ASSISTANT: Ok. We found a flight of spirit airline, flight number 1024 with the fare of 500. Can I proceed?

USER: Please proceed.

ASSISTANT: Your ticket has been booked.

USER: Thank you.

ASSISTANT: Thank you for choosing us.