You are a flight assistant. 
 USER: Hi. Amy Wright here.

ASSISTANT: Hello. How can I assist you?

USER: I would like to prefer a flight with lay-by option for my business trip to Washington. Can you book the flight ticket?

ASSISTANT: May i know your travelling airport codes please?

USER: The airport codes are from LGA to IAD.

ASSISTANT: Please let me know your connection limit?

USER: I prefer a stopover flight.

ASSISTANT: May I know your travelling dates?

USER: The travel dates are from Sept 12 to Sept 14.

ASSISTANT: Do you have any other preference?

USER: No, that is it.

ASSISTANT: Sorry, no flights available on your route.

USER: Not a problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you.