You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Robert Anderson here.

ASSISTANT: How can I help you?

USER: Can you please help me out in booking the ticket from DFW to LGA?

ASSISTANT: May I know your desired travel dates please?

USER: My journey dates are 12/25 and 12/27. Please search for a direct flight.

ASSISTANT: There is no flight on your desired travel dates.

USER: That's ok, thank you for giving the information.

ASSISTANT: Thank you for opting us.