You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I need to travel from DCA to OAK, can you help me in doing that?

ASSISTANT: Sure, could you please share your journey dates?

USER: My journey dates are Nov 04 to 06.

ASSISTANT: Do you have any preferences?

USER: I need a connecting flight which return in evening time.

ASSISTANT: May I know your good name?

USER: I am Rachel Evans.

ASSISTANT: Sorry, no flights are available as per your requirements.

USER: Ok, no issues. Thank you for the information.

ASSISTANT: Thank you for reaching us.