You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I serve you at this moment?

USER: Could you please book a flight ticket from OAK to EWR?

ASSISTANT: Sure, on which dates would you like to travel?

USER: I want to travel on May 21 and return on May 23.

ASSISTANT: May I know your good name please?

USER: My name is Daniel Nelson.

ASSISTANT: Do you need a direct or connecting flight?

USER: I need a connecting flight.

ASSISTANT: Do you have any other preferences?

USER: No.

ASSISTANT: There are no flights found on your requested dates.

USER: Not a problem, thank you.

ASSISTANT: Thank you for reaching us.