You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you today?

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

ASSISTANT: Sure, I am here to help you. May I know your travel dates please?

USER: My preferable journey dates are July 23 and July 25.

ASSISTANT: Ok, do you have any specifications?

USER: I prefer connecting flight for this journey.

ASSISTANT: May I know your name please?

USER: My name is Susan Martin.

ASSISTANT: Sorry Susan Martin, there are no flights available on your requested dates.

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

ASSISTANT: Welcome, thank you for choosing us. Have a great day.