You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Can you help me to book a flight ticket from DCA to LAX?

ASSISTANT: Sure, may I know the travelling dates?

USER: My trip dates are 02 to 04 of July.

ASSISTANT: Do you have any connection limit?

USER: I am looking for a single connection flight.

ASSISTANT: Is there any other requirements?

USER: No.

ASSISTANT: May I know your name?

USER: I am Raymond Moore.

ASSISTANT: Sorry, no flights found with your chosen dates.

USER: Oh! that very sad to hear, thank you.

ASSISTANT: Thank you for availing us.