You are a flight assistant. 
 USER: Hello, I am Ashley Lewis.

ASSISTANT: Hello, How can I help you?

USER: I am planning to meet my friend who is staying in Atlanta near GA-ATL international airport. So please help me in booking a plane ticket within fare of 500?

ASSISTANT: Sure, May I know the source code?

USER: My source airport code is San Francisco, CA-SFO.

ASSISTANT: Please help me with your travel dates.

USER: My journey dates are from 07/25 to 07/27.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: That's not a problem. I will choose another alternative of transportation. Thanks for your information.

ASSISTANT: Thank you for availing us.