You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you today?

USER: I want to fly to Las Vegas with the direct flight to treat an emergency case, can you please help me in booking?

ASSISTANT: Sure, please share your planned trip dates?

USER: Sure, I intend to start my journey on May 9th and my return date will be on May 11th.

ASSISTANT: May I know your name?

USER: I am Ruth Mitchell.

ASSISTANT: Do you have any class preference?

USER: I prefer to fly in business class ticket.

ASSISTANT: May I know your airport codes?

USER: My boarding and landing airport codes are SEA and LAS.

ASSISTANT: Any other requirements to be met?

USER: No.

ASSISTANT: Sorry, there are no flights found with your given details.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you for reaching us.