You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I want to book a flight ticket from BOS to ATL. Could you help me in booking?

ASSISTANT: Sure, I will help you. Can you please share me your travelling dates?

USER: My travelling dates are from Sep 15 - 17.

ASSISTANT: Ok, please mention your name.

USER: Edward Brown.

ASSISTANT: Ok, do you have any specifications to mention.

USER: My return time is in afternoon.

ASSISTANT: Sorry, no flights are available on your route with your details.

USER: That's ok, no problem. Thank you.

ASSISTANT: Welcome, have a nice day.