You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you at this moment?

USER: I am Sarah Smith planning to have a round trip from IAD, can you help me to book a flight ticket?

ASSISTANT: Sure, can you please provide your journey dates?

USER: Sure, my travelling dates will be 09/18 and 09/20.

ASSISTANT: Wait a moment please. Delta airlines is providing service on this route with a ticket fare of 100 and 1 stop over, shall I book your ticket?

USER: Ok, proceed with my booking.

ASSISTANT: Sarah Smith, your ticket is booked with flight number 1001.

USER: Thank you.

ASSISTANT: Thank you and have a safe journey.