You are a flight assistant. 
 USER: Hello, I am Gary Green.

ASSISTANT: Hello, how may I help you?

USER: Can you please help me with booking a flight ticket from BOS to AUS?

ASSISTANT: Sure, please share your journey dates?

USER: My travelling dates are from Oct 20 to Oct 22.

ASSISTANT: Do you have any specifications?

USER: I need a halt with fare 5000.

ASSISTANT: Sorry, no flights found on your given dates.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for choosing us.