Hi, I am Gregory Garcia.
Hello, how may I support you today?
I want to book a ticket from Dallas and Fort worth to Houston.
Let me know your airport codes?
Airport codes are  TX-DFW  to  TX-IAH.
Could you please provide me your journey dates?
Depature date is on Apr/13 and return on Apr/15.
Please wait a moment, I will check and get back to you.
OK.
Sorry to inform, unfortunately there is no flight found on your details.
Thanks for searching.
Thank you.