You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can you please help me in booking a flight ticket from Los Angeles, LAS to Washington, DCA?

ASSISTANT: Sure, please share your journey dates?

USER: My journey dates are from Apr 14 to Apr 16.

ASSISTANT: Do you have any specifications?

USER: I need a lay by in between my journey.

ASSISTANT: Is there any class preference?

USER: I am ok with any class.

ASSISTANT: May I know your good name?

USER: My name is Lisa Lopez.

ASSISTANT: Sorry, no flights found on your given details.

USER: Ok, that's not a problem. Thanks for your information.

ASSISTANT: Thank you for choosing us.