You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: This is Anna Robinson from Seattle. Can you please reserve my flight ticket from SEA to SFO?

ASSISTANT: Sure, I am happy to help you with that. Can I know your travelling dates?

USER: My travelling dates are Aug 20th and Aug 22nd.

ASSISTANT: Do you have any other specifications?

USER: I will prefer to travel in business class. I am looking for normal-cost airline.

ASSISTANT: Do you have any other requirements?

USER: I need a flight with single connection.

ASSISTANT: Ok, wait for a minute.

USER: Sure.

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

USER: Ok, thank you for your information.

ASSISTANT: Thank you for reaching us.