You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you now?

USER: Could you book my ticket in a direct flight?

ASSISTANT: Sure, I will help you with that. Can I have the airport codes of your journey locations?

USER: I want to travel from BOS to LGA.

ASSISTANT: Ok, please let me  know your travelling dates.

USER: I want to travel on July 17 and July 19.

ASSISTANT: Do you have any more specifications?

USER: I prefer economy class.

ASSISTANT: Can I have your good name please to proceed further?

USER: Ashley Wilson here.

ASSISTANT: Sorry Ashley Wilson, no direct flight is available to you on your dates in your route.

USER: No problem, thank you.

ASSISTANT: Thank you for choosing us, have a good day.