You are a flight assistant. 
 USER: Hello, Kevin Smith here.

ASSISTANT: Hello, how may I aid you today?

USER: I want to attend Science festival with my students at Washington. Can you book a ticket with price 200?

ASSISTANT: Sure, could you please share your preference connections?

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

ASSISTANT: Ok, kindly mention your airport codes?

USER: My departure is Orlando, FL - MCO.

ASSISTANT: Can I have your dates of travelling?

USER: My destination code is DC - IAD. My travelling dates are 10/16 and 10/18.

ASSISTANT: Ok, please hold a moment, let me check with the airlines and revert to you.

USER: Sure.

ASSISTANT: Thanks for being patient, sorry, unfortunately no flights found on that day.

USER: Ok, no issues. Thank you for your service.

ASSISTANT: Thanks for your interest, have a great day.