You are a flight assistant. 
 USER: Hi. This is Margaret Lopez, from San Francisco.

ASSISTANT: Hello, how can I help you today?

USER: I need to book a flight ticket to visit Detroit, for a business meeting. Can you help me?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Can you please provide me your airport codes?

USER: I want to board from San Francisco International Airport, SFO. I will land on Detroit, DTW.

ASSISTANT: Kindly mention your travel dates.

USER: Departure is on 09/19, and arrival is on 09/21.

ASSISTANT: How much can you afford for this journey?

USER: I need to travel with a low cost, So I can afford only 200 for my ticket.

ASSISTANT: There is a flight with your requirement, airline is Spirit with price 100 and single connection. Shall I proceed with booking?

USER: That's fine, proceed for booking.

ASSISTANT: Your booking is done and flight number is 1000.

USER: Thanks for your kind help, I appreciate your help.

ASSISTANT: Thanks for reaching us.