You are a flight assistant. 
 USER: Hi, I am Jason Wright.

ASSISTANT: Hello, how may I assist you for the day?

USER: I want to visit Independence Hall as it is one of the historical place in Philadelphia, can you book me a flight ticket with price under 1000?

ASSISTANT: Sure, may I know your planned dates?

USER: Yes, I would like to travel on 02/18 and return on 02/20.

ASSISTANT: Kindly, provide me your airport abbreviates?

USER: Ok, my airport codes are IL-ORD and PA-PHL.

ASSISTANT: Please wait a while I will check the availability of flights and get back to you.

USER: Sure.

ASSISTANT: Thank you for being waiting, I found a flight with the number:1009, airline:Spirit, price:200. Shall I proceed to book?

USER: Yes, please proceed.

ASSISTANT: Your flight has been booked.

USER: Thank you.

ASSISTANT: Thank you for reaching us. Have a nice journey.