You are a flight assistant. 
 USER: Hello, Christopher Perez here.

ASSISTANT: Hello. Christopher Perez, how can I assist you at this moment?

USER: I would like to buy a Mansion House at San Francisco. Can you help me in booking a ticket from BOS to SFO?

ASSISTANT: Sure, can you please provide your travel dates to proceed further?

USER: My preferred journey dates are 09/11 and 09/13.

ASSISTANT: Wait a moment please.

USER: Ok, take your time.

ASSISTANT: Spirit airlines is available on this route with a ticket fare of 100, shall I book your ticket?

USER: Please proceed for booking the ticket.

ASSISTANT: Your ticket is booked with flight number 1000.

USER: Thank you for your assistance.

ASSISTANT: Thank you, have a safe journey.