You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I would like to meet my sister in my weekend holidays, so can you please help me with flight ticket booking for my journey from PHl  to ORD locations?

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

USER: My planned travel dates are from Mar 23 to Mar 25.

ASSISTANT: Please provide me the specifications.

USER: Sorry my source code is PHL. Please make sure that, I need to book my ticket in economy class.

ASSISTANT: Ok, may I know the name?

USER: Sure, myself Eric Perez.

ASSISTANT: Sorry, there are no flights are available for your desired intent.

USER: That's ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you for the information.