You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, do you need any help from us?

USER: I am planning to book a ticket from LAX to DCA. Can you please help me out?

ASSISTANT: Ok, could you please share your departure and arrival day?

USER: I am planning to travel on July 22 and return back on July 24.

ASSISTANT: Ok, could I have your name please?

USER: My name is Nancy Nelson.

ASSISTANT: Ok, do you need direct or connecting flight?

USER: I am looking for a connecting flight.

ASSISTANT: Ok, do you have any other specifications?

USER: My depart time should be morning.

ASSISTANT: Sorry, there is no flight on your requested travelling dates.

USER: That's fine, thank you for your service.

ASSISTANT: You are welcome, have a great day.