You are a flight assistant. 
 USER: Hi, Dennis Evans here.

ASSISTANT: Hello, how may I help you?

USER: I would like to visit Oakland, CA - OAK due to holidays. Can you please book a ticket with a price limit of 500? I prefer a direct flight.

ASSISTANT: Sure, may I know on which dates you want to travel?

USER: I want to depart on 08/24 and return on 08/26.

ASSISTANT: Ok, can you please share your source code?

USER: My origin is NV - LAS.

ASSISTANT: Please stand by.

USER: Ok.

ASSISTANT: Thank you for waiting, sorry to inform no flights were found with your requirements.

USER: Ok, no problem. Thanks for your response.

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