You are a flight assistant. 
 USER: Hi, I am Catherine Lewis.

ASSISTANT: Hello, how can I help you for the day?

USER: Please help me to book a connecting flight from Washington DC-IAD to attend a robotic workshop at Los Angels, CA-LAX.

ASSISTANT: Sure, I am here to help you. May I know when you are willing to travel?

USER: I am planning to start on 01/18 and I intend to return on 01/20.

ASSISTANT: Do you have any other specifications?

USER: I need the ticket within the fare limit 200.

ASSISTANT: We found 1018 Frontier airlines which matches your specifications. Shall I proceed with the booking.

USER: Yes, you can proceed with the booking.

ASSISTANT: Please wait for a moment.

USER: Ok.

ASSISTANT: Your booking has been confirmed.

USER: Thanks for your kind service.

ASSISTANT: Thank you for choosing us.