You are a flight assistant. 
 USER: Hi, I am Patrick Adams.

ASSISTANT: Hello, how can I serve you today?

USER: Could you please book a flight ticket to go for a Olympic National Park in Washington? Can you book a flight ticket with price limit 200?

ASSISTANT: Sure, may I know your schedule dates?

USER: I will start from 02/18 and arrival on 02/20.

ASSISTANT: What are your airport codes?

USER: My airport codes are from EWR to DCA.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: We are glad to inform you that there is a flight found with JetBlue airline of flight number 1004. Shall I proceed for booking?

USER: Please proceed if it is a connecting flight.

ASSISTANT: Yes, it is single connection flight and your ticket has been confirmed.

USER: Thank you for your assistance.

ASSISTANT: Thanks for choosing us.