You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you out?

USER: I am Nicole Williams here. I need to book a flight ticket from AUS to BOS. Can you please help me with booking?

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: My travelling dates are from 11/19 to 11/21.

ASSISTANT: Sorry, there are no flights found in our database.

USER: Not a big problem, anyway, thank you for the information.

ASSISTANT: Thank you for reaching us.