You are a flight assistant. 
 USER: Hello, I am Brain Edwards.

ASSISTANT: Hello, how can I help you today?

USER: Can you please help me to book a flight ticket from LAX to OAK?

ASSISTANT: Sure, kindly mention your travel dates.

USER: My travelling dates are Sept 4 to Sept 6.

ASSISTANT: How much can afford for this journey?

USER: I can afford up to 500.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry to say, no flights founds with your requirement.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thanks for reaching us.