You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Jonathan Wilson. I want to book a ticket from EWR to SFO to attend seminar, can you help me in booking?

ASSISTANT: Sure, can you share your trip dates?

USER: I am departing on 08/31 and return on 09/02.

ASSISTANT: Sorry, there is no flight on your given dates.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you for opting us.