You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: Please book me a ticket from IAD to IAH to meet my family.

ASSISTANT: Sure, please share your travel dates.

USER: I  have planned to travel on Dec 10th and return on Dec 12th.

ASSISTANT: May I know your good name?

USER: Myself Richard Robinson.

ASSISTANT: Do you need a stopover?

USER: I like connecting flight.

ASSISTANT: Is there any specifications do you have?

USER: Please search business class.

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

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for opting us.