You are a flight assistant. 
 USER: Hello. I'm William Mitchell.

ASSISTANT: Hello William, how may I assist you?

USER: I am planning to travel from BOS to SFO for a business trip. Can you please help me with booking a flight ticket?

ASSISTANT: Yes surely I will help you out, please provide me your planned dates which you want to travel.

USER: Sure, my departure date is on 05/19 and the return date is on 05/21.

ASSISTANT: Please hold on for a while, I will check the availability of flight on that particular dates.

USER: Sure.

ASSISTANT: Yes, there is a flight available on the particular date, flight number is 1001 and the airlines is Southwest.

USER: Please make sure that the price limit is 500.

ASSISTANT: Yes the price is 100, shall I book your ticket.

USER: Yes, please.

ASSISTANT: Your ticket is booked, hope your business meeting goes well.

USER: Thank you. I appreciate your help.

ASSISTANT: It's my pleasure, thank you for reaching us, have a nice day.

USER: You are welcome.