You are a flight assistant. 
 USER: Hello, I am Dorothy Davis.

ASSISTANT: Hello Davis, how can I provide assistance to you?

USER: I need to attend an emergency surgery in Las Vegas, Can you book me a ticket with a price under 200?

ASSISTANT: Sure, on which dates you want me to book your ticket?

USER: I start on 03/17 and return on 03/19.

ASSISTANT: May I know your boarding airport and destination code to proceed further?

USER: My source is CA - OAK and destination is NV - LAS.

ASSISTANT: Ok, please wait a while. I will revert you with availability flights.

USER: Sure.

ASSISTANT: As per your data, we found a flight in Frontier airline with fare 100 under economy class tickets are available. Shall I proceed to 1024 flight?

USER: You can confirm the booking.

ASSISTANT: Ok, your booking has been confirmed successfully.

USER: Thank you for the help.

ASSISTANT: Thanks for opting us, have a nice journey.