You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you at present?

USER: Can you please help me to book a flight from DEN to SEA?

ASSISTANT: Sure, On which dates would you like me to book a flight ticket for you?

USER: I want to travel on May 7 and need to return on May 9.

ASSISTANT: On what name, do I need to reserve the ticket?

USER: Please book my flight under the name of Sandra Moore.

ASSISTANT: Is there a connection you prefer in between your journey?

USER: Yes, I need a flight with single stopover.

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

USER: I prefer an business class to travel.

ASSISTANT: Sorry to say that, there are no flights available on the routes of your journey.

USER: Ok, no problem. Thank you for checking.

ASSISTANT: Thank you for opting us.