You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am John Harris. I am panning to visit a San Francisco from BOS to SFO, can you help me to book a ticket?

ASSISTANT: Sure, please let me know your journey dates.

USER: My departure date is 09/25 and return date is 09/27. My price limit is 1000.

ASSISTANT: John, there is a flight-1000 available with price 200. Shall I book the ticket?

USER: Sure, you can proceed.

ASSISTANT: Your ticket is confirmed with Spirit airlines.

USER: That's great to hear.

ASSISTANT: Thank you for choosing our services.

USER: Thank you for your help.