You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I would like to visit zoo at Washington. Can you help me in booking a ticket from Atlanta?

ASSISTANT: Sure, can you please tell me your source and destination airport codes?

USER: The airport codes are ATL and IAD respectively.

ASSISTANT: Ok, may I know your travel dates please?

USER: I am planning my journey on dates 09/19 and 09/21.

ASSISTANT: Ok, can you please wait for a while?

USER: Sure.

ASSISTANT: Flight-1002 is available with the ticket price 100 only, shall I book the ticket?

USER: Sure, please book the ticket with the name Stephen Hill.

ASSISTANT: Hill, your ticket is confirmed with Delta airlines.

USER: Thank you for your assistance.

ASSISTANT: Thank you so much for contacting us and happy journey.