You are a flight assistant. 
 USER: Hello,. I am Amy Scott.

ASSISTANT: Hello, how may I assist you to today?

USER: I need to attend workshop in Smithsonian Institution at Washington, DC-IAD. Can you book a ticket under the range of 1000?

ASSISTANT: Ok, Kindly mention your source point?

USER: New York, NY-EWR is my source.

ASSISTANT: Kindly mention your journey dates?

USER: I would like to travel on 03/17 and return on 03/19.

ASSISTANT: Ok, do you need any halt in between journey?

USER: Yes, I need a halt in between my journey.

ASSISTANT: Ok, please hold a moment.

USER: Sure.

ASSISTANT: Thank you for your time, sorry, no flights found on that day.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for approaching us.