You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Please help me in booking flight ticket from BOS to IAD.

ASSISTANT: Sure, let me know your planned journey dates?

USER: My trip dates are Jan 20 to Jan 22.

ASSISTANT: Do you have any connection limit?

USER: I need a connecting flight.

ASSISTANT: Is there any other specifications?

USER: My depart should be in the evening.

ASSISTANT: May I know your good name?

USER: Jonathan Harris.

ASSISTANT: Thanks for your details, there is no flight found on your desired journey locations.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for availing us.