You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I render you today?

USER: I want to go to OAK next week so can you please help me in flight ticket booking process from LGA?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your travel dates please?

USER: I want to take off on Sept 15 and book my return ticket also on Sept 17.

ASSISTANT: Ok, do you have any specifications?

USER: I want a direct flight.

ASSISTANT: Ok, hold on for a moment. Let me check the best available flight for you.

USER: Ok, I want to travel in economy class flight.

ASSISTANT: May I know your name please?

USER: Sure, my name is Carol Allen.

ASSISTANT: Sorry Carol Allen, there are no flights available on your requested dates.

USER: It's ok no problem. Thank you for your information.

ASSISTANT: Welcome, thank you for choosing us. Have a great day.