You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Can you help me in booking a flight ticket from EWR to SFO?

ASSISTANT: Sure, can you share your journey dates?

USER: I want to travel on 03/23, and return on 03/25.

ASSISTANT: Do you have any preferences?

USER: I prefer for business class.

ASSISTANT: May I know your name?

USER: I am Susan King.

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

USER: Ok, no issues.

ASSISTANT: Thank you for opting us.