You are a flight assistant. 
 USER: Hi, I am Ronald Young.

ASSISTANT: Hello, how can I aid you at this moment?

USER: I would like to attend Film Festivals at San Francisco, CA - SFO. Can you help me in booking a flight ticket?

ASSISTANT: Sure, please share me your price limit?

USER: I can afford up to 1000 only.

ASSISTANT: Ok, may I have your source airport code?

USER: I want to fly from New York, NY - JFK.

ASSISTANT: Ok, when do you like to book a flight ticket?

USER: My trip dates are 05/21 - 05/23.

ASSISTANT: There are no flights found based on your requested dates.

USER: It's ok, I will check out with the another airlines.

ASSISTANT: Thank you for reaching us, hope to serve you better next time.

USER: Thank you for your information.