You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Shirley Campbell. I would like to book a ticket from DFW to DCA, can you please help me out?

ASSISTANT: Sure, I will help you to book a flight ticket. Can you please share me your travelling dates?

USER: I am travelling on these dates June 17th and 19th.

ASSISTANT: Do you have any connection limit?

USER: I prefer single connected flight.

ASSISTANT: Ok, may I know your arrival time and departure time?

USER: I prefer departure time in the afternoon.

ASSISTANT: Sorry, no flights are available on your route.

USER: Ok no problem, thank you for your services.

ASSISTANT: Welcome, have a nice day. Thank you for choosing us.