You are a flight assistant. 
 USER: Hello, I am George Garcia.

ASSISTANT: Hello, how may I assist you today?

USER: I need to book a flight ticket from OAK to DFW to meet my friend. Can you help me in booking a connected flight?

ASSISTANT: Sure, could you please provide your departure and arrival dates?

USER: My journey dates are Apr 06 and Apr 08.

ASSISTANT: Do you have any other specifications to be met?

USER: I am looking for a return flight time at afternoon.

ASSISTANT: Are you looking for any preferred class?

USER: No.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Thank you for your valuable time, unfortunately no flights available on that route.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for opting us.