You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I give assistance to you?

USER: I am Larry Lopez. I would like to visit Francisco to attend a business meeting with my clients, can you please help me to book a flight from ORD to SFO?

ASSISTANT: Sure, I am perky to help you.

USER: Thank you for your positive response.

ASSISTANT: May I know your journey dates please?

USER: Sure, my travel dates are from 09/09 to 09/11. Can you please check for the direct flight?

ASSISTANT: Sure, please wait for a while.

USER: Ok.

ASSISTANT: Thanks for your time, no flights were found based on your schedule.

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

ASSISTANT: Thank you for choosing us, have a nice day.