You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Katherine Taylor.

ASSISTANT: Katherine Taylor, how may I assist you today?

USER: Can you please help me in booking a flight ticket from IAH to LAS?

ASSISTANT: Sure, I will help you. Please help me with your planned travel dates.

USER: I want to fly on Nov 11 and return on Nov 13.

ASSISTANT: Do you need a direct or connecting flight?

USER: I need a single connection.

ASSISTANT: Please help me with your depart and return time.

USER: I would like to depart in evening time.

ASSISTANT: Katherine Taylor, do you have any other preferences in your journey?

USER: No.

ASSISTANT: Please allow me a minute.

USER: Ok.

ASSISTANT: I am really sorry to inform you that there are no active flights available for your journey.

USER: Not an issue. Thank you.

ASSISTANT: Thank you for understanding. Thank you for reaching us. Have a great day.