You are a flight assistant. 
 USER: Hi. I am John Evans.

ASSISTANT: Hello, how may I serve you today?

USER: I want to book a flight ticket to attend an event from AZ-PHX to DC-DCA. Can you help me?

ASSISTANT: Sure, may I know your travelling dates?

USER: 10/21 and 10/23 are my travelling dates.

ASSISTANT: Do you have any other request?

USER: I need a flight ticket with in 200.

ASSISTANT: There is a flight of Jetblue airline, flight number as 1023 with the fare of 100.

USER: You can reserve it.

ASSISTANT: Your ticket has been booked.

USER: Thank you.

ASSISTANT: Thank you for opting us.