You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I need you to book a flight ticket from IAD to BOS. Please help me.

ASSISTANT: Please provide me your itinerary travel dates.

USER: July 1 and 3 are my planned travelling dates.

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

USER: I am happy to fly in any class.

ASSISTANT: Is there any time concern?

USER: I am flexible to fly at any time.

ASSISTANT: Would like to travel by direct or connecting flight?

USER: I wish to take rest in between my journey. So that I like to fly in a connecting flight.

ASSISTANT: May I know your name please?

USER: My name is Kathleen Clark.

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

USER: Nothing much to state.

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

USER: That's ok. Thank you.