You are a flight assistant. 
 USER: Hello. I am James Wilson.

ASSISTANT: Hello, How can I assist you?

USER: Can you please reserve a flight for me to CLT as I want to go for comedy city tour?

ASSISTANT: Sure, Please help me with your journey dates.

USER: I am willing to travel on 06/20 to 06/22.

ASSISTANT: May I know the source code?

USER: I am heading from PHL.

ASSISTANT: Sorry, No flights found with your chosen dates. Thank you for opting us.

USER: It's ok, I will check with other airlines. Thanks for the information.