You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I render you?

USER: I am looking for a flight from BOS to IAD, can you help me out in booking the flight ticket?

ASSISTANT: Sure, please provide your itinerary dates.

USER: My trip dates are from Mar 16th till Mar 18th.

ASSISTANT: May I know your connection limit?

USER: I just need a direct flight that's it. No, more requirement I have in my intent.

ASSISTANT: Please wait for a while. May I know your name?

USER: Myself Mary Martinez.

ASSISTANT: Sorry Mary Martinez, no flights are available on your route.

USER: That's ok, not an issue. Thank you for your help.

ASSISTANT: Thank you for choosing us.