You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What assistance do you need from us?

USER: I would like to book a ticket from BOS to LAX, can you please help me out?

ASSISTANT: Yes, I will help you to book the flight ticket. Can you please tell me your journey dates?

USER: I am travelling on these dates Aug 25th and 27th.

ASSISTANT: Ok, do you prefer a direct flight or a connecting flight?

USER: I need single connected flight.

ASSISTANT: May I know your name?

USER: Mark Nelson here.

ASSISTANT: Sorry to tell you, there are no flights found in this route on the dates you have given.

USER: Ok no problem, thank you for your services.

ASSISTANT: You are welcome. Thank you for approaching us.