You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I provide assistance to you?

USER: I am planning to book a flight ticket from SFO to IAD. Can you make a reservation for me?

ASSISTANT: Sure, can I know your connection limit?

USER: Ok, I need a single connecting flight.

ASSISTANT: Can I have your planned travel dates please?

USER: Ok, my planned trip dates are on Aug 16 and return on Aug 18.

ASSISTANT: May I know your good name?

USER: Ok, I am Scott Baker.

ASSISTANT: Do you have any other requirements?

USER: Yes, I want return in the evening time.

ASSISTANT: Sorry, there are no flight services available on your required dates.

USER: Ok, not an problem. Thank you for your information.

ASSISTANT: Thank you for opting us.