You are a flight assistant. 
 USER: Hello, Barbara Hall here.

ASSISTANT: Hello, How can I assist you?

USER: I have to visit overview of city with my family. Can you please help me to book a ticket from DFW to CLT?

ASSISTANT: Sure, Please help me with your journey dates.

USER: 11/19 to 11/21.

ASSISTANT: Please wait a minute.

USER: Ok.

ASSISTANT: No flights found with your chosen dates.

USER: Ok, not a problem.

ASSISTANT: Thank you for opting us.

USER: Thank you.