You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you today?

USER: I am Richard Adams. Can you please help me to book a flight ticket from LAX - LAS?

ASSISTANT: Sure, will you provide your depart and return dates?

USER: My depart is on 04/18 and return on 04/20.

ASSISTANT: Sure, wait a minute.

USER: OK.

ASSISTANT: We found a flight on spirit airline, flight number as 1019 with the fare of 200.

USER: Please proceed to book.

ASSISTANT: Your ticket has been booked.

USER: Thank you.

ASSISTANT: Thank you for reaching us.