You are a flight assistant. 
 USER: Hi, I am Gary Johnson.

ASSISTANT: Hello. How can I aid you?

USER: I am planning to visit echo canyon trail & recreation area in PHX. Can you aid me to book a direct flight?

ASSISTANT: Sure, I am glad to help you in booking the flight ticket. May I know your planned travel dates?

USER: My travel dates are Feb 27 and Feb 29.

ASSISTANT: Please provide me the travel airport codes.

USER: My source is from SFO.

ASSISTANT: Sorry, there are no flights available as per your request.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for reaching us.