You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I be of your service?

USER: I am Lisa Nelson, a basketball coach. I have a meeting with National Basketball Association team. On 04/19, I need a connecting flight.

ASSISTANT: Sure, I'll help you.

USER: Ok.

ASSISTANT: When do you want to return?

USER: I will return with in two days that is on 04/21.

ASSISTANT: May I know your price preference?

USER: Please check flights with price 500.

ASSISTANT: Could you please let me now your preferable journey points?

USER: I have to board at DEN. My destination is PHL.

ASSISTANT: Thanks for giving information, please give me sometime.

USER: Sure.

ASSISTANT: Thanks for waiting, unfortunately there are no flights found with your requested details.

USER: Ok.

ASSISTANT: Thanks for opting us, have a nice day.

USER: Thanks for your response, I will go for other alternative.