You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I'm planning to visit Washington, can you please book the ticket from LAS to DCA?

ASSISTANT: Sure, may I know the planned travel dates?

USER: Sure, my planned departure and return travel dates are 22nd and 24th of May.

ASSISTANT: Please provide me the specifications.

USER: I prefer single connected flight.

ASSISTANT: May I know the name?

USER: My name is Shirley Garcia.

ASSISTANT: Sorry, there are no flights are available for your desired intent.

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

ASSISTANT: Thank you for reaching us.