You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what services are you seeking from us?

USER: Can you please help me to book a flight from IAD to BOS?

ASSISTANT: Sure, On which dates would you like me to book a flight ticket for you?

USER: I want to travel on Mar 17 and need to return on Mar 19.

ASSISTANT: For booking purpose I required your name, can I know your name?

USER: I am James Hall.

ASSISTANT: Is there a connection you prefer in between your journey?

USER: I need a connecting flight.

ASSISTANT: Do you have any other restrictions to be met?

USER: My depart time must be in the afternoon.

ASSISTANT: Sorry to say that, there are no flights available on the routes of your journey.

USER: Ok, not an issue. Thank you for checking.

ASSISTANT: Thank you for reaching us.