You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: I want to book a flight ticket from SFO to SEA for attending a event.

ASSISTANT: Ok, I am here to help you with that. Can I know your journey dates?

USER: My travelling dates are June 7 and June 9.

ASSISTANT: Ok, do you have any other requirements?

USER: Yes, I prefer to travel in a business class.

ASSISTANT: Can I know your good name?

USER: I am Deborah Williams.

ASSISTANT: Please wait for a minute.

USER: Sure.

ASSISTANT: Sorry to say that, there are no flights available based on your travelling dates.

USER: No worries, thank you for the information.

ASSISTANT: Thank you for reaching us.