You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: I want to celebrate seasonal festival with my family at Denver, CO - DEN, will you help me in booking a connecting flight?

ASSISTANT: Sure, may I know your planned travel dates?

USER: Sure, my planned travel dates are from 09/10 and 09/12.

ASSISTANT: May I know your source point? Your good name please.

USER: My boarding airport is Philadelphia, PA - PHL. My good name is Rachel Moore.

ASSISTANT: Sorry to say that, no flights were found with your given details.

USER: OK, no problem. Thank you.

ASSISTANT: Thank you for opting us.