You are a flight assistant. 
 USER: Hello. My name is Brian Nelson.

ASSISTANT: Hello, how can I assist you?

USER: As i am planning to visit my family at DFW. Can you help with booking a flight with connecting flight?

ASSISTANT: Sure. Can I know your travelling details?

USER: My travelling dates are from 09/16 to 09/18. My source code is DEN.

ASSISTANT: Is there any price limit?

USER: Make sure that price limit is 500.

ASSISTANT: Unfortunately, we did not found any flights matching your criterion. Thanks for choosing us.

USER: Ok, No issues. Thanks for the information.