You are a flight assistant. 
 USER: Hello, I am Jeffrey Roberts.

ASSISTANT: Hello, How can I assist you today?

USER: I  planned to organise a cultural fest at Washington DC-DCA on 04/22. Could you please book a ticket  from  Los Angeles LAX and  I intent to return on 04/24/.

ASSISTANT: Sure, We are here to help you. Please wait a moment. I will check the availability of flights and get back to you.

USER: Ok.

ASSISTANT: Thank you for your waiting. There are no flights found on your planned dates.

USER: Thank you  for your service.

ASSISTANT: Thank you for choosing us.