You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello.

USER: I am Melissa King.

ASSISTANT: How may I assist you today?

USER: I want to book a flight ticket to meet my uncle in Las Vegas, will you help me in booking a flight ticket with a price limit of 200?

ASSISTANT: Sure, may I know your travel dates?

USER: I want to travel on 04/28, and need to catch return flight on 04/30.

ASSISTANT: To check the flight availability we need your airport codes, please provide me your airport codes?

USER: I need to leave from my nearest airport HOU to reach LAS.

ASSISTANT: Do you have any specification?

USER: I need a stopover in between my journey.

ASSISTANT: We found a flight on your details with airline Southwest, flight number: 1019. Shall I book this ticket?

USER: Proceed with the booking.

ASSISTANT: Your ticket has been booked.

USER: Thanks for the help.

ASSISTANT: Thank you so much.