You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Joseph Lee. Can you help me booking a flight ticket from DCA to PHL?

ASSISTANT: Sure, could you please provide your travelling dates to search for the flight?

USER: I will start on 06/26 and return on 06/28.

ASSISTANT: May I know your depart and return time?

USER: I need to return on evening time.

ASSISTANT: Do you have any requirements?

USER: I need a break in my journey.

ASSISTANT: Sorry to inform you that unfortunately there is no flights available by the given details.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us.