You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I have to attend a Live Concert at Las Vegas, could you please help me with booking a flight ticket from HOU to LAS?

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

USER: I would like to depart on Mar 29th and return on Mar 31st.

ASSISTANT: May I know your connection limit?

USER: I am looking for a connecting flight.

ASSISTANT: Do you have any class preference?

USER: I would prefer not to fly a low- cost airline.

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

USER: Make sure that my depart time must be afternoon and return time must be evening.

ASSISTANT: May I know your name to proceed further?

USER: I am Patricia Walker.

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

USER: Ok, not an issue. Anyways, thank you for the information.

ASSISTANT: Thank you for contacting us.