You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: Can you please help me in booking a flight ticket from Austin, AUS to reach Oakland, OAK?

ASSISTANT: Sure, may I know your travel dates?

USER: My travelling dates are from Aug 01 to Aug 03.

ASSISTANT: Do you have any other specifications?

USER: I prefer to travel in economy class flight.

ASSISTANT: Please share me your name.

USER: My name is Benjamin Hernandez.

ASSISTANT: Sorry, there is no flight at this moment.

USER: Ok, that's not a problem. Thank you.

ASSISTANT: Thank you.