You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Kathleen Anderson. I need to book a ticket to meet my parents in my hometown after a long time from DEN to SFO.

ASSISTANT: Sure Anderson, can I know the travel dates please?

USER: My travelling dates are 02/18 and return on 02/20.

ASSISTANT: Ok, wait a moment please.

USER: Sure.

ASSISTANT: Sorry, there are no flights on your dates.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for approaching us.