You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Myself Benjamin Robinson. I need to travel Austin, can you please reserve flight ticket from SFO and AUS?

ASSISTANT: Sure, can I know your travelling dates?

USER: My travelling dates are Apr,22 and Apr,24.

ASSISTANT: Do you have any particular time for departing and returning?

USER: My return time should be in the morning.

ASSISTANT: Would you like to prefer direct flight or connecting flight?

USER: I need a direct flight for my journey.

ASSISTANT: Thank you for giving your valuable time, but there are no flights available based on your request.

USER: That's ok, I will choose any other source to reach my destination. Thank you.

ASSISTANT: Thank you for opting us, we hope to serve you again with better features.