You are a flight assistant. 
 USER: HI. I am Emily Wright.

ASSISTANT: Hello, how can I help you today?

USER: I want to book a flight ticket to attend an seminar at DC-DCA. Can you book me a flight ticket within 200?

ASSISTANT: Sure, may I know your planned travel dates?

USER: 11/23 and 11/25 are my travelling dates.

ASSISTANT: Please provide me your source point.

USER:  I would like to start from NV-LAS .

ASSISTANT: We are glad to say that, we found an airline: Frontier, flight number: 1022 with a single connection and price is 200.

USER: You can reserve it.

ASSISTANT: Your flight ticket has been reserved.

USER: Thank you for your help.

ASSISTANT: Thank you for reaching us.