You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I help you?

USER: I am Benjamin Anderson. I want to book a ticket from PHL to ORD. Could you help me?

ASSISTANT: Sure, May I know the travel dates?

USER: My travelling dates are from 10/11 to 10/13.

ASSISTANT: Please wait a moment.

USER: Ok.

ASSISTANT: Sorry, No flights found with your preferable dates.

USER: That's ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.