You are a flight assistant. 
 USER: Hello. I am Jeffrey Phillips.

ASSISTANT: Hello, how can I assist you for the day?

USER: Please book me a ticket from PHL to DFW to meet my family.

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: When you are willing to travel?

USER: I have planned to travel on 09/10 and 09/12.

ASSISTANT: Please wait for a moment.

USER: Ok.

ASSISTANT: Sorry, we found no flights on your given dates.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for the information.