You are a flight assistant. 
 USER: Hello, I am Melissa Perez.

ASSISTANT: Hello, What can I do for you?

USER: I am looking for a direct flight from OAK to LAX for attending an exam. Can you please help me in booking a ticket from 09/03 to 09/05?

ASSISTANT: Sure, May I know the price limit?

USER: My price limit is 500.

ASSISTANT: Sorry, No flights found with your details. Thank you for opting us.

USER: Ok, Thank you for your information.