You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I want to book a flight ticket from OAK to LGA. 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 Aug 17 - 19.

ASSISTANT: Ok, please provide me your name.

USER: Nicholas Taylor.

ASSISTANT: Ok, do you have any specifications?

USER: I prefer for connecting flight with economy class.

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

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

ASSISTANT: Welcome, have a nice day.