You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I serve you today?

USER: I want to book a flight from OAK to DFW. Can you please help me with the booking?

ASSISTANT: Sure, may I know your planned trip dates?

USER: Sure, my travelling dates are Jan 10 - Jan 12.

ASSISTANT: Do you have any connection limit?

USER: I need a flight with single connection.

ASSISTANT: Is there any class preference?

USER: Yes, I prefer an economy class.

ASSISTANT: Please forward your name.

USER: My name is Kimberly Nelson.

ASSISTANT: Do you have any other specifications?

USER: Yes, my depart time must be in the afternoon.

ASSISTANT: Please be on hold.

USER: Sure.

ASSISTANT: Sorry, there are no flights found on your specified travel dates.

USER: Ok, not an issue. Thank you for the information.

ASSISTANT: Thank you.