You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you today?

USER: I need to book a flight ticket from SFO to LAS, Can you please help me for booking?

ASSISTANT: Sure, may I know your planned travel dates?

USER: I would like to travel on 09/28 to return on 09/30.

ASSISTANT: Do you have any limits on number of connections?

USER: I need a connecting flight.

ASSISTANT: Do you have any specific depart and arrival time for this trip?

USER: No.

ASSISTANT: Do you have  any air line preferences?

USER: I want to fly with normal cost airline.

ASSISTANT: Thank you, may I know your name for documentation purpose?

USER: Emily Evans.

ASSISTANT: Do you want any class preference for this journey?

USER: I need a economy class.

ASSISTANT: United Airlines providing a flight with the price 100 with 0 connection and it's in economy class. Can I proceed for the booking?

USER: Ok, proceed for booking.

ASSISTANT: Your flight ticket reservation done with the flight number 1006.

USER: Thanks for your information.

ASSISTANT: Welcome, thank you for reaching us.