You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you out?

USER: I am Debra Hall, I need to book a flight ticket to AUS from OAK. Can you please help me to book a flight ticket?

ASSISTANT: Sure, I will help you out. May I know your travelling dates too?

USER: Thank you, my travelling dates are 01/25 and 01/27.

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

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

ASSISTANT: Thank you for choosing us.