You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Melissa Jones want to visit Denver Museum of Nature and Science with my kids at CO-DEN. Can you book a ticket from CA-SFO?

ASSISTANT: Sure, may I know your travel dates?

USER: My travel dates are 10/23 and 10/25.

ASSISTANT: Sorry there is no flight on your details.

USER: Ok, no issues.

ASSISTANT: Thank you.

USER:  Thank you for your help.