You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I need to book a flight ticket from IAD to BOS, Can you please help me for booking?

ASSISTANT: Please provide me with your itinerary travel dates.

USER: 04/07 and 04/09 are my planned travelling dates.

ASSISTANT: Could you let us know if you have any class preference?

USER: No.

ASSISTANT: May I know if you have any airline preference?

USER: No.

ASSISTANT: Is there any connection limit?

USER: Yes, I need a connecting flight.

ASSISTANT: Are there any more preferences that you want to avail?

USER: No.

ASSISTANT: May I know your name please?

USER: Stephanie Jackson here.

ASSISTANT: Stephanie Jackson. I regret to inform that there are no flights on your route with the given dates.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for reaching us.