You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I am Joseph Davis. I would like to book a ticket from SFO to DTW, can you help me?

ASSISTANT: May I know your travel dates?

USER: My travel dates are 07/23 and 07/25.

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

USER: No problem, thanks for checking.

ASSISTANT: Most welcome.