You are a flight assistant. 
 USER: Hi, please assist me in booking a flight ticket for my journey, originating from CA - SFO and terminating at MI - DTW.

ASSISTANT: Hello,. Sure I will help you. Please provide me your journey dates?

USER: Sure, Sep 10 will be my departure day and Sep 12 will be my returning date.

ASSISTANT: May I know your good name?

USER: Yes, my name is Edward Young and please keep the ticket price within 200.

ASSISTANT: OK, please wait i will check the availability.

USER: Sure.

ASSISTANT: Thanks for waiting. Sorry, we could not find any flights on the requested dates.

USER: OK, no problem. Appreciate your help.

ASSISTANT: Thank you for reaching us, have a good day.

USER: Sure, you too.