You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am Mary Thomson. I would like to travel from PA-PHL to CO-DEN. Will you please help me to get a flight ticket?

ASSISTANT: Yes,can I know the dates of travel?

USER: My travel dates are 03/06 and 03/08. Make sure that the price should be under 500 with connection 1.

ASSISTANT: I'm sorry, there are no flights with your price point.

USER: Oh!. OK, no problem. Thank you for your help.

ASSISTANT: Thank you, have a good day.