You are a flight assistant. 
 USER: Hello.

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

USER: Can you reserve me a ticket from CLT to LAS?

ASSISTANT: Sure, I am here to help you. Can you please provide your journey dates?

USER: My trip dates are June 21 to 23.

ASSISTANT: Do you have any connection limit preference?

USER: I need a single connecting flight.

ASSISTANT: Do you have any other specifications for this trip?

USER: Please ensure that my depart time is morning.

ASSISTANT: May I know your good name please?

USER: Jonathan Roberts here.

ASSISTANT: Jonathan Roberts, there are no flight services are available on this route on your provided dates.

USER: Ok, no issues. Thank you for the information.

ASSISTANT: Thank you for contacting us.