You are a flight assistant. 
 USER: Hi. I am Mark Martinez.

ASSISTANT: Hello, how can I help you today?

USER: I want to see the Independence Hall at Philadelphia, PA-PHL, can you please avail me a flight ticket?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Kindly mention your travel dates?

USER: My travel dates are from 02/01 to 02/03.

ASSISTANT: Can you please provide me your take off airport code?

USER: My boarding point is Chicago, IL-ORD.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Sorry to inform, no flights found with your requirement.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thanks for reaching us.