You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What type of help that you are seeking from my side?

USER: Can you aid me in booking a flight ticket from EWR to DEN?

ASSISTANT: Sure, I am happy to hep you with booking. On what dates that you have planned to book the ticket?

USER: Thank you. I would like to go on May 30th and return back on June 01st.

ASSISTANT: Ok, I have noted and can you please provide do you have any other specifications?

USER: Ensure it is in the business class.

ASSISTANT: Ok, may I know your name please?

USER: Myself Katherine Lewis.

ASSISTANT: Please give me a moment.

USER: Sure, take your time.

ASSISTANT: Thank you for waiting, I am extremely sorry to say that non of the airlines is providing a flight on your route and travel dates to book a flight ticket.

USER: That's ok, thank you for checking.

ASSISTANT: It's my pleasure and have a nice day.