You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you out?

USER: Please book me a flight ticket from IAD to ATL to meet my family.

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: I have planned to travel on Jan 29th and return on Jan 31st.

ASSISTANT: Can I know your name please?

USER: Betty Jackson.

ASSISTANT: Do you need any specifications?

USER: I prefer connecting flight.

ASSISTANT: Can I know your other preferences?

USER: No, thanks.

ASSISTANT: Sorry, there are no flights found in our database.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you.