You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Donna Turner.

ASSISTANT: How can I help you at this moment?

USER: I am planning to visit Oakland, can you please book me a ticket from CLT to OAK?

ASSISTANT: Sure, I will help you with that. Can you please mention your preferable travel dates?

USER: My preferable journey dates are from July 19 and July 21.

ASSISTANT: Do you have any preferences regarding timings of your journey?

USER: I prefer afternoon return flight.

ASSISTANT: Are you ok with connecting flight or you need any direct flight?

USER: I prefer connecting flight.

ASSISTANT: Do you have any another specifications?

USER: No.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry, no flights are available in this route as per your requested dates.

USER: Ok, not an issue. Thank you for providing information.

ASSISTANT: Thank you for reaching us.