You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

USER: I want to book a ticket from HOU to EWR. Could you book a ticket?

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

USER: Travel dates are from July, 11 to July, 13.

ASSISTANT: Do you have any class preference?

USER: I prefer to travel in economy class.

ASSISTANT: May I know your connection limit?

USER: I prefer connecting flight.

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

USER: I would like to depart in the afternoon time.

ASSISTANT: May I know your name to proceed further?

USER: I am Ronald Hill.

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

USER: Thank you.

ASSISTANT: Thank you for contacting us.