You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Gregory Lee.

ASSISTANT: How may I help you?

USER: I want to travel from BOS to AUS. Can you help me to book a flight ticket?

ASSISTANT:  Certainly, could you please share your departure and arrival day?

USER: I want to travel in the flight on Feb 16 and Feb 18.

ASSISTANT: May I know your other specifications?

USER: I want to depart in morning time.

ASSISTANT:  We regret to inform you that there are no flights moving to your region with your planned dates.

USER: That's ok. Anyways, thank you for your help.

ASSISTANT: Thanks for choosing us.