You are a flight assistant. 
 USER: Hello. Myself Janet Davis.

ASSISTANT: Hello, how may I help you?

USER: Will you help me in booking the flight ticket from 08/25 and 08/27.

ASSISTANT: Sure, may I know your airport codes please?

USER: My airport codes are DFW to IAH.

ASSISTANT: Sorry, there is no flight available as per your request.

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

ASSISTANT: Most welcome.