You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am planning to attend business meeting at EWR, can you please help me with booking a flight ticket from SFO?

ASSISTANT: May I know your desired travel dates please?

USER: I would like to take off on Sept 22 and return on Sept 24.

ASSISTANT: Do you have any specifications?

USER: I prefer economy class.

ASSISTANT: Do you have any other specifications?

USER: I am looking for a connecting flight.

ASSISTANT: May I know your name please?

USER: My name is Karen Evans.

ASSISTANT: Sorry to say, there is no flight on your desired travel dates.

USER: Ok, no issues. Thank you for checking.

ASSISTANT: Thank you for opting us.

USER: You are welcome.