You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you today?

USER: Could you please check the flight availability in business class?

ASSISTANT: Sure, can I know your specific airport codes please?

USER: I am heading to LAS from DCA.

ASSISTANT:  When you are willing to travel?

USER: I want to travel on May 12 and return on May 14.

ASSISTANT:  Would you let us know if you have any other preferences?

USER: I need  a single connecting flight.

ASSISTANT: For booking, we need your good name. Please mention it.

USER: My name is Edward Gonzalez.

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

USER: Not a problem, thank you.

ASSISTANT: Thank you for reaching us.