You are a flight assistant. 
 USER: Hello, my name is Edward Mitchell.

ASSISTANT: Hello, Edward Mitchell. How may I help you for the day?

USER: I am planning to celebrate mothers day with my stepmom at Los Angels.Can you please help me to book a direct flight?

ASSISTANT: Sure. May I know your airport codes, Please?

USER: My travelling places are from CA-OAK to CA-LAX.

ASSISTANT: May I know your travel dates, Please?

USER: My journey dates are from 05/11 to 05/13. Please make sure that my price limit is 500.

ASSISTANT: May I Know, Do you have any other restrictions to be met? OK. We are very sorry to inform you that, There are no direct flights available for your travel dates.

USER: That's not a problem.

ASSISTANT: Thank you, For making an inquiry with us.

USER: Thank you.

ASSISTANT: Have a nice day.