You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I guide you  today?

USER: I'm Stephanie Perez. I am planning to attend music concert at San Francisco, can you please help me with booking a flight ticket?

ASSISTANT: I am happy to help you with that. Can you please share your travelling dates?

USER: Sure, I would like to take off on 02/12 and return back on 02/14.

ASSISTANT: May I know your airport codes to proceed further?

USER: My source airport code is DFW and the destination airport code is SFO.

ASSISTANT: Wait for a moment, I will get back with your details.

USER: Ok, but please make sure that the price limit does not exceed 200.

ASSISTANT: Sorry to say that there is no reservation under your details.

USER: Ok, no issues. I will try another way to complete my trip.

ASSISTANT: Thank you for reaching us.

USER: Anyways, thank you for checking.