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

ASSISTANT: Hello, how may I help you?

USER: I am planning to fly from Austin TX-AUS, to visit one of the historical places and helps to learn new things. Can you please aid me in booking a flight ticket to Oakland CA-OAK?

ASSISTANT: Sure, may I know your depart and return dates?

USER: I want to depart on 07/20 from Austin. I intend to return on 07/22.

ASSISTANT: Do you need halt in between your journey?

USER: I need a direct flight.

ASSISTANT: Sorry, there are no flights found with your given dates.

USER: Ok, no issues at all. Thank you for your kind service.

ASSISTANT: Thank you.