You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: As I am a scientist, I want to attend science festival with my students at Washington. Can you do the reservation?

ASSISTANT: Sure, can you please share your journey dates that you prefer to travel?

USER: My trip dates are 03/21 and 03/23.

ASSISTANT: May I know your airport codes?

USER: My airport codes are SFO-IAD.

ASSISTANT: Do you require any stopovers in your journey?

USER: I need break in my journey.

ASSISTANT: Please share your name.

USER: Matthew Thompson here.

ASSISTANT: Is there any other specifications?

USER: No.

ASSISTANT: Sorry to say, no flights found with your requirement.

USER: No problem, Thanks for the information.

ASSISTANT: Thanks for reaching us.