You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Katherine Lewis here. I want to travel from DFW to SFO for attending a Seminar. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, may I know your trip dates?

USER: My travelling dates are from 05/30 to 06/01. Make sure my price limit is 500.

ASSISTANT: Sorry, there are no flights found on your name.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for reaching us.