You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Alexander Martin.

ASSISTANT: How can I serve you today?

USER: Can you help me to book flight ticket from IAH to CLT?

ASSISTANT: May I know your trip dates?

USER: My planned trip dates are Sept 22 and Sept 24.

ASSISTANT: Do you need any connection limit?

USER: I need a connecting flight in between my journey.

ASSISTANT: Can you share your depart and arrival time?

USER: My return time should in the afternoon.

ASSISTANT: Do you need any other specifications?

USER: No.

ASSISTANT: Please wait.

USER: Sure.

ASSISTANT: Sorry, there are no flights available on your preferable dates.

USER: Ok, not a problem. Thank you for your information.

ASSISTANT: Thank you for choosing us.