You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I serve you at this moment?

USER: I want to book a ticket from IAD to SEA, can you help me?

ASSISTANT: Sure, I am here to help you. On which dates would you like me to book a flight ticket for you?

USER: My travel dates are Apr 15 and 17.

ASSISTANT: Is there any connection limit?

USER: I want a connecting flight.

ASSISTANT: Please let me know if you have any other requirements.

USER: I prefer to travel in business class.

ASSISTANT: To proceed further, may I know your name?

USER: I am Jason Brown.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Sorry, there were no flights found with business class.

USER: No problem, thanks for checking.

ASSISTANT: Thank you for approaching us.