You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Elizabeth Parker here.

ASSISTANT: How may I help you today?

USER: I want to participate in a mechanic workshop, can you book a ticket from SFO to LAS?

ASSISTANT: Sure, may I know your travelling dates?

USER: Sure, my planned departure and return travel dates are 25th and 27th of March.

ASSISTANT: Can I know your class preference?

USER: I prefer economy class to travel.

ASSISTANT: Do you have any other specifications?

USER: I want to return in the evening time and I need single connected flight.

ASSISTANT: Okay, wait a minute.

USER: Sure, I'll be online.

ASSISTANT: There is a flight on Delta airline, flight number 1017 with the fare of 100 and return time is 2:00AM.

USER: That's fine, you can proceed for booking the ticket.

ASSISTANT: Your ticket has been booked.

USER: Thank you so much for your help.

ASSISTANT: Thank you for reaching us.