You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: I am Pamela Garcia. I want to meet my uncle at Seattle, please help me to book my flight ticket from DCA to SEA.

ASSISTANT: Can you share your travelling dates?

USER: Sure, I will depart on Oct 29th and I would like to return back on Oct 31st.

ASSISTANT: May I know your depart and arrival timings?

USER: I only need my return time should be in the afternoon.

ASSISTANT: Please wait a second.

USER: Sure, I prefer for a single connection flight.

ASSISTANT: There are no flights available in our database.

USER: Sad to hear that, thank you for checking.

ASSISTANT: Thank you for choosing us.