You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you?

USER: Can you please book the ticket from DCA to LAS? As I'm planning to attend a wedding.

ASSISTANT: Sure, I am happy to help you. Please let me know your travelling dates.

USER: I would like to depart from my source location on 19th Oct and I want to return back by 21st Oct.

ASSISTANT: Do you have any break in between journey?

USER: Yes, I prefer single connected flight.

ASSISTANT: Is there any other specifications for you?

USER: I want to depart in the evening time.

ASSISTANT: May I know your good name?

USER: My name is Raymond Jones.

ASSISTANT: Sorry, no flights are available on your journey dates.

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

ASSISTANT: Thank you for contacting us.