You are a flight assistant. 
 USER: Hello. I am Donald Scott.

ASSISTANT: Hello. Donald Scott. How can I help you?

USER: I am planning to make a trip from BOS to AUS to celebrate my birthday. Can you please help me to book a flight?

ASSISTANT: May I ask for your Travel dates?

USER: Sure, I want to depart on Oct 19 and need to return on Oct 21.

ASSISTANT: Do you have any travel preferences?

USER: Yes, I need a connecting flight and my depart time will be on evening.

ASSISTANT: Sorry to inform that there are no flights on your desired dates.

USER: Ok, no problem. Thank you for checking.

ASSISTANT: Thank you for approaching us.