You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: Carol Hall here. Can you book my ticket from DFW to CLT?

ASSISTANT: Sure, can you please share your preferable travel dates?

USER: My preferable dates are from 06/23 to 06/25.

ASSISTANT: Ok, please allow me a moment to check for the availability of flight in this route.

USER: Sure, take your time.

ASSISTANT: I appreciate your patience. Carol, I am sorry to inform you that the there is no flight available at your requested dates.

USER: It's ok. Thank you for your help.

ASSISTANT: You are welcome. Thank you for contacting us.