You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: How can I book a flight ticket from PHL to ORD?

ASSISTANT: Sure, may I know your travel dates?

USER: Ok, please book for the dates 12/20 and 12/22 respectively.

ASSISTANT: Please wait.

USER: Ok, I will wait and I want to book the ticket on the name Jonathan Rodriguez.

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

USER: Ok, not a problem. Thank you for assisting me.

ASSISTANT: Thank you for reaching us.