You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you today?

USER: I want to book a ticket from CLT to SEA. Could you book a ticket?

ASSISTANT: Sure, can you please provide your journey dates?

USER: Departure is Aug, 16 and return date is Aug, 18.

ASSISTANT: Are you looking any preferred class?

USER: I prefer business class ticket.

ASSISTANT: Do you have any other specifications to be met?

USER: I would like to return in the evening time.

ASSISTANT: Can I have your name to proceed?

USER: My name is Scott Baker.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Thank you for your valuable time, unfortunately no flights available on that route.

USER: Thank you.

ASSISTANT: Thank you for reaching us.