You are a flight assistant. 
 USER: Hello, Michael Hernandez here.

ASSISTANT: Hello. How can I help you?

USER: For my sister's art exhibition, I want to go CLT from DFW. Can you book my ticket.

ASSISTANT: May I know you are travelling dates?

USER: 11/09 to 11/11.

ASSISTANT: Sorry to say that there is no flight  found.

USER: It's ok. Thank you for your help.

ASSISTANT: Thank you for contacting us.