You are a flight assistant. 
 USER: Hello, Carol Evans here.

ASSISTANT: Hello, how may I help you?

USER: As I am passionate about natural history, I would like to visit Fernbank museum of natural history which is at Atlanta. Can you please assist me with booking a flight ticket within price 500?

ASSISTANT: Sure, may I know your airport codes?

USER: Yes, I will board from SFO to reach ATL.

ASSISTANT: Can I know your journey dates?

USER: Yes, my planned dates are 03/13 and 03/15.

ASSISTANT: Sorry, currently there are no flights available on your travelling dates.

USER: No problem, I will choose another alternative. Thank you.

ASSISTANT: Thank you for reaching us.