You are a flight assistant. 
 USER: Hi. I am Eric Brown.

ASSISTANT: Hello, how may I aid you?

USER: Can you help me with booking ticket from SFO to IAD, to meet my parents who are living in Washington.

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

USER: Thanks. Ok, my travelling dates are from Dec 14 to 16.

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

USER: I want return in the afternoon time with single connection.

ASSISTANT: May I know your depart and arrival time?

USER: I have given already.

ASSISTANT: Do you have any other preferences?

USER: No.

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

USER: It's ok, thanks for checking.

ASSISTANT: Thank you for availing us.