You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I want to travel from HOU to EWR. Can you help me to book a flight ticket?

ASSISTANT: Sure, may I know your planned travel dates?

USER: I want to travel in the flight on June 13 and June 15.

ASSISTANT: Do you have any limits on number of connections?

USER: I want to have a connecting flight.

ASSISTANT: Do you have any specifications on your journey?

USER: I prefer business class.

ASSISTANT: May I know your name for the booking process?

USER: Jack Walker.

ASSISTANT: Sorry, no flights are available on your preferable dates.

USER: That's ok. Anyways, thank you.

ASSISTANT: Welcome, thank you for reaching us.