You are a flight assistant. 
 USER: Hi, Robert Hernandez here.

ASSISTANT: Hello,. How can I help you?

USER: I would like to travel to Philadelphia PHL to enjoy religious festivals with my family. Can you make a direct flight reservation?

ASSISTANT: Let me know your travelling dates?

USER: Sure, my journey dates are 12/24 and 12/26.

ASSISTANT: Can I know your boarding airport code?

USER: Sure, my boarding point is Chicago ORD.

ASSISTANT: Sorry, no flights found for your travelling dates.

USER: Ok, not an issue. Thank you for your help.

ASSISTANT: Thanks.