You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Robert Scott here. I want to book a flight reservation on the dates from 06/23 to 06/25 for my holidays, can you help me?

ASSISTANT: Sure, can I know your airport codes?

USER: My desired airport codes for this journey will be from IAH - CLT.

ASSISTANT: Scott, there is no flight available on your requested dates.

USER: Ok, no issues with it. Thank you for checking with availability.

ASSISTANT: You are welcome.