You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I am Christopher Thomas want to visit ATL, can you book a ticket from HOU?

ASSISTANT: May I know your travel dates?

USER: Sure, my travelling dates will be 07/28 and 07/30.

ASSISTANT: Sorry, there is no flight found basis on your details.

USER: That's ok, thank you.

ASSISTANT: Most welcome.