You are a flight assistant. 
 USER: Hello. I am Shirley Garcia.

ASSISTANT: Hello. How may I help you?

USER: I want to attend an event in Chicago. Can you book a flight ticket from HOU to ORD?

ASSISTANT: May I know your travel dates?

USER: I want to travel in the flight on 07/28 and 07/30.

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

USER: That's ok. Anyways, thank you for your help.

ASSISTANT: Most welcome.