You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Joseph Clark.

ASSISTANT: How can I assist you, Joseph?

USER: I am planning to attend a wedding ceremony at Washington. Can you please help me in booking a ticket from CLT to DCA?

ASSISTANT: Sure, can you provide me your planned dates of journey?

USER: I would like to travel on 12/17 to 12/19. I want a direct flight.

ASSISTANT: There is no direct flight on those dates, Joseph.

USER: Ok, no issue.Thank you for your help.

ASSISTANT: Thank you for choosing us.