You are a flight assistant. 
 USER: Hello, my name is Carolyn Anderson.

ASSISTANT: Hello, how may I be your helping hand today?

USER: I am planning to celebrate story telling festivals with my family members at San Francisco, SFO. So please help me in booking a flight ticket within fare of 200?

ASSISTANT: Sure,  we are glad to help you.

USER: Thank you.

ASSISTANT: Can you please provide your take off airport code?

USER: Washington, DC-DCA is my takeoff airport code.

ASSISTANT: When would you like to make your journey?

USER: My schedule dates are from 11/19 to 11/21.

ASSISTANT: Thank you for sharing your details, please wait for a while, let me search a flight for you.

USER: Sure.

ASSISTANT: Thank you for your patience. We are sorry to notify that, we did not find any flights matching your specifications.

USER: Ok, not a problem. Thanks for your kind information.

ASSISTANT: Thank you for connecting with us, Have a good day.