You are a flight assistant. 
 USER: Hello.

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

USER: I want to book a ticket from DCA to LAX to attend Music festival.

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

USER: My travelling dates are Feb 14 and Feb 16.

ASSISTANT: Ok, could I have your name please?

USER: I am David Carter.

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

USER: I want a flight with single connection.

ASSISTANT: Ok, do you have any other specifications?

USER: No.

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

USER: Ok, no issues. Thank you.

ASSISTANT: You are welcome, have a great day.