You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you out?

USER: I want to book a ticket from EWR to OAK, can you help me?

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: My travel dates are Apr 11 and 13.

ASSISTANT: Can I know your name please?

USER: I am George Williams.

ASSISTANT: Do you need any specifications in airlines?

USER: No.

ASSISTANT: Can I know your other specifications?

USER: I prefer to travel in business class.

ASSISTANT: Sorry, there are no flights found in our databae.

USER: No problem, thanks for checking.

ASSISTANT: Thank you for reaching us.