You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you for today?

USER: I planned to meet my friend in PHL, can you please help me to book a flight ticket from SEA?

ASSISTANT: Can you please share on what dates you are willing to travel?

USER: I prefer to travel on May 15 and May 17.

ASSISTANT: Are you looking for a connecting flight or direct flight?

USER: I need a direct flight.

ASSISTANT: Do you have any class preferences?

USER: I would like to travel in business class.

ASSISTANT: Do you have any other requirements that you are looking for?

USER: No.

ASSISTANT: Can you please provide your name to proceed further?

USER: I am Debra Nelson.

ASSISTANT: Sorry, there are no flights available at your request.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for contacting us, have a nice day.