You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: Can you please help me to find a flight from LAS to IAD for my business trip?

ASSISTANT: Sure, can you please share your travel dates?

USER: My planned dates are from June 6th and return on June 8th.

ASSISTANT: May I know your connection limit?

USER: I need a direct flight for this journey.

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

USER: I would prefer a business class reservation only.

ASSISTANT: May I know your name to proceed further?

USER: Myself Emily Smith.

ASSISTANT: I am sorry to inform you that there is no flight available at your request.

USER: Oh! That's fine. Anyways, thank you for checking.

ASSISTANT: Thank you for contacting us.

USER: Most welcome.