You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I guide you today?

USER: Elizabeth Davis here. I want to book a connecting flight from DCA to BOS. Can you help me in that?

ASSISTANT: Sure, I am happy to help you with that. Can you please share your preferable journey dates?

USER: My trip dates are Mar 06 to Mar 08.

ASSISTANT: Do you have any class preference?

USER: No.

ASSISTANT: Is there any connection limit?

USER: I need a connecting flight.

ASSISTANT: Do you have any specifications?

USER: My depart time should be in the afternoon.

ASSISTANT: I am sorry to say that there is no flight found under your details.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you.