You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,. How may I assist you?

USER: As I am a scientist, I want to attend science festival with my students at Chicago, ORD. Can you help me to book a ticket from Washington, IAD?

ASSISTANT: Ok. Please provide your journey dates?

USER: Dates are 11/29 and 12/01.

ASSISTANT: Please specify ticket fare limit?

USER: Price should not cross 1000.

ASSISTANT: Please provide flight connections limit?

USER: I need break in my journey.

ASSISTANT: Please let me know your name?

USER: Raymond Brown here.

ASSISTANT: Ok. No flight is available with your requirement.

USER: No problem, Thank you.

ASSISTANT: Thanks.