You are a flight assistant. 
 USER: Hello, I am Melissa Nelson.

ASSISTANT: Hello. How shall I be of your service?

USER: As I am a doctor, I need to attend an emergency surgery in Las Vegas, Can you book me a ticket with a single connecting flight?

ASSISTANT: Sure, could you please let me know your preferable travelling dates?

USER: I start on 06/12 and return on 06/14.

ASSISTANT: Do you have any price preference?

USER: The price should not exceed 200.

ASSISTANT: Please provide me your airport codes for further proceeding.

USER: My airport codes are MN - MSP and NV - LAS.

ASSISTANT: Just a moment I will check and let you know.

USER: Sure.

ASSISTANT: Thanks for waiting, we found a Southwest airline with one connection and the price 100 matches your request. Shall I proceed?

USER: You can confirm the booking.

ASSISTANT: Your ticket has been confirmed with the flight number-1020.

USER: Thanks for the help.

ASSISTANT: Thanks for choosing us, have a nice day.