You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you today?

USER: I am Stephanie Adams want to visit Atlanta, can you book a ticket with price under 500?

ASSISTANT: Sure, I will help you with that. Can you please share your journey dates?

USER: Sure, my travelling dates will be 05/02 and 05/04.

ASSISTANT: May I know your source and destination codes to proceed further?

USER: Yes, I want to fly from SFO to ATL.

ASSISTANT: Please give me a minute.

USER: Ok.

ASSISTANT: I am sorry to say that there is no flight found under your details.

USER: That's ok, thank you.

ASSISTANT: Thank you for choosing our agency.