You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I am Brandon Turner, want to travel from AUS to SFO. Please help me in booking my ticket.

ASSISTANT: Sure, please share me your trip dates.

USER: My trip dates are from 03/22 to 03/24.

ASSISTANT: Is there any class preferences for you?

USER: No.

ASSISTANT: Please share if you want to travel in any specific time?

USER: My return time will be in the evening with 1 connection.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry to say that, there are no flights available on the routes of your journey.

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

ASSISTANT: Thank you for reaching us.