You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello,how can I serve you?

USER: I am Nicholas Martinez. I want to book a flight ticket.

ASSISTANT: May I know the source and destination place?

USER: I want to travel to CA-OAK from TX-AUS. My journey dates are June/8 and June/10.

ASSISTANT: OK,do you have any other travelling requirements ?

USER: Yes, my price limit is 200 with one connection.

ASSISTANT: OK,please wait for a couple of minutes.

USER: OK.

ASSISTANT: Thank you for waiting ,sorry to inform you that there is no flight found that matches your requirements.

USER: OK, Thank you for your information.

ASSISTANT: Thank you for choosing us.