You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: Can  you help me in booking a flight ticket from HOU to EWR?

ASSISTANT: Sure, I will help you with that. Can you please mention your preferable travel dates?

USER: I want to travel on 04/21, and return on 04/23.

ASSISTANT: May I know your name for further process?

USER: I am Barbara Carter.

ASSISTANT: Do you have any another specifications?

USER: I want to return in the afternoon time, and prefer for economy class.

ASSISTANT: Is there any additional preferences do you have?

USER: I need a single connecting flight.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry, no flights are available in this route as per your requested dates.

USER: Ok, no issues. Thanks for the information.

ASSISTANT: Thank you for reaching us.