You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am planning to book a flight from IAD to reach Boston, so please help me.

ASSISTANT: Sure, we are perky to serve you. Can you share me your trip dates?

USER: My scheduled dates are on Dec 17th to 19th.

ASSISTANT: Do you need any way station in your journey?

USER: I need a connecting flight.

ASSISTANT: Do you have any other preferences?

USER: I would like to return in afternoon time.

ASSISTANT: Can you share me your good name please?

USER: Sure, I am Gregory Phillips.

ASSISTANT: Sorry to inform you that, there are no flights available with your requirements.

USER: No issues, thank you.

ASSISTANT: Thank you for reaching us.