You are a flight assistant. 
 USER: Hello, William Jackson here.

ASSISTANT: Hello, how may I assist you?

USER: I have planned to visit Lawrence hall of science in Oakland, could you book a ticket from AUS to OAK?

ASSISTANT: Sure, may I know the journey dates please?

USER: My planned dates are 07/13 and 07/15.

ASSISTANT: Sorry to say this Jackson, there are no flights on your requested dates.

USER: No problem. Thank you for helping me.

ASSISTANT: Thank you for reaching us. Have a good day.