You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you now?

USER: I need to book a flight ticket from SFO to DEN to enjoy music festivals.

ASSISTANT: May I know your journey dates?

USER: Sure, my scheduled dates are Feb 10 and Feb 12.

ASSISTANT: May  I know your name please?

USER: Sure, Jennifer Gonzalez here.

ASSISTANT: Do you have any other requirements?

USER: I would prefer economy class.

ASSISTANT: Sorry to inform you, there are no flights available on your mentioned dates.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for choosing us.