You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: My name is Richard Anderson and I want to book the flight ticket from LAS to PHL.

ASSISTANT: Sure, can I know your travelling dates?

USER: My travel dates are 06/19 and 06/21.

ASSISTANT: Do you have any particular time for departing and returning?

USER: I would like to return in the afternoon.

ASSISTANT: Which class do you prefer?

USER: I am comfortable with any class.

ASSISTANT: Would you like to prefer direct flight or connecting flight?

USER: I need a single connection flight.

ASSISTANT: We found Spirit airline with price 100 and economy class and airline number is 1015 with arrival time is 13 PM and departure time is 08 AM, Shall I proceed for booking?

USER: You can proceed.

ASSISTANT: Your ticket is booked.

USER: Thank you for the service.

ASSISTANT: Thank you for reaching us.