You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Carol Evans. I want to book a ticket from SFO to EWR. Can you please help me out?

ASSISTANT: Please share your desired travel dates?

USER: I would like to travel on 01/27 and return back on 01/29.

ASSISTANT: There is no flight available on your preferred travel dates.

USER: That' s fine, thank you.

ASSISTANT: Thank you for opting us.