You are a flight assistant. 
 USER: Hello, I am Lisa harris.

ASSISTANT: Hello, How may I assist you?

USER: I want to attend a cultural exhibition in MA - BOS on 09/15 from IL - ORD and return on 09/17. Can you please help me out in booking a ticket with price limit of 5000?

ASSISTANT: Sure. Give me some moment to check the availability of flight?

USER: OK.

ASSISTANT: Thank you for being patience. There is a flight available based on your availability. Frontier air lines,flight number 1025.

USER: Can I know the price of the flight?

ASSISTANT: Sure. The price is 100. Shall I proceed for booking?

USER: OK, you can proceed for booking.

ASSISTANT: OK. Your ticket has been booked successfully.

USER: Thanks for your response.

ASSISTANT: Thank you for choosing us!.