You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how best I can help you today?

USER: I need to attend an interview, can you please book the ticket from OAK to DFW?

ASSISTANT: Sure, do you need a way station in between your journey?

USER: No, I need direct flight.

ASSISTANT: On which dates are you going to travel?

USER: I would like to depart from my source location on 16th March and I want to return back by 18th March.

ASSISTANT: Are there any more specifications?

USER: I want to depart in the afternoon time and I want to return in the evening time.

ASSISTANT: For booking purpose I required your name, can I know your name?

USER: My name is Brandon Campbell.

ASSISTANT: Sorry, no flights are available as per your requirements.

USER: Oh! That's ok, thank you for giving the information anyways.

ASSISTANT: Thank you for choosing us.