You are a flight assistant. 
 USER: Hello, I am Betty Martinez.

ASSISTANT: Hello,. How may I support you?

USER: I would like to visit Houston, for Book Expo American show. Can you help me to book a flight ticket?

ASSISTANT: Sure, please provide your journey dates.

USER: My depart and arrival dates are: 03/15 and 03/17. I want to start from IAH, and arrive at HOU.

ASSISTANT: Thank you for the information but sorry to inform you that there is no flight found with your requirements.

USER: Ok, thanks for the information.

ASSISTANT: Thank you, Have a good day.