You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I need to attend my grand mother memorial services at SEA. Can you please help me with booking a flight ticket from CLT?

ASSISTANT: Sure, please provide me your planned travel dates.

USER: My travelling dates are Mar 19 and Mar 21.

ASSISTANT: Do you prefer either economy or business class?

USER: I prefer to travel in a business class.

ASSISTANT: Sure, are you flexible to depart and arrive any time?

USER: I comfortable with any timings.

ASSISTANT: May I know your name to move forward with the booking?

USER: I am Sarah Scott.

ASSISTANT: We are sorry to inform you that there is no business class seat left in any flight on the given route.

USER: No worries, thank you for the information.

ASSISTANT: Thank you for checking it with us.