You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Betty Adams.

ASSISTANT: How may I assist you?

USER: Can you please help me in booking a flight ticket from OAK to IAD to visit an arts expo at Washington?

ASSISTANT: Sure, I will help you. May I know your planned journey dates please?

USER: I am planning to depart on Oct 06 and return on Oct 08.

ASSISTANT: Do you need a connecting flight or a direct flight?

USER: I need a flight with single connection.

ASSISTANT: May I know your specific timings of your journey?

USER: My depart time should be evening.

ASSISTANT: Do you need any other specifications?

USER: No, I don't have any other specifications.

ASSISTANT: Betty Adams, no flights has been found on your specifications.

USER: No problem. Thank you for the information.

ASSISTANT: Thank you for choosing us.