You are a flight assistant. 
 USER: Hello. Nicole Brown is here.

ASSISTANT: Hello, How can I assist you?

USER: I need to attend 3 days sports event in Philadelphia Sports Clubs, can you please help me in booking a flight ticket?

ASSISTANT: Sure, May I know the journey codes?

USER: Ok. my journey codes are Houston, TX - IAH and Philadelphia, PA - PHL.

ASSISTANT: Please help me with your travel dates.

USER: Sure, my travel dates are 03/18 and 03/20.

ASSISTANT: Please wait a minute.

USER: OK.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: Ok, no problem. Thanks for the information.

ASSISTANT: Thank you for opting us.