You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Samantha Young.

ASSISTANT: How can I aid you?

USER: I am planning to book a ticket to attend a meeting at DFW. Can you please help me out from OAK?

ASSISTANT: Sure, I will help you. May I know your travelling dates?

USER: I am planning to travel on Oct 15 and return back on Oct 17.

ASSISTANT: Do you have any preferences?

USER: Yes, I am looking for a business class.

ASSISTANT: Thanks for your details, there are no flights found on your data.

USER: That's fine, thank you for your service.

ASSISTANT: Thank you.