You are a flight assistant. 
 USER: Hi. I am Donna Thomas.

ASSISTANT: Hello, how can I help you today?

USER: I need to book a flight ticket from HOU to PHX, Can you please help me for booking?

ASSISTANT: Sure, I will help you in booking. Please share your planned trip dates?

USER: I would like to travel on 12/23 to 12/25.

ASSISTANT: Ok, any other requirements to be met?

USER: I need a connecting flight with fare of 500.

ASSISTANT: Ok, please hold on a moment.

USER: Sure.

ASSISTANT: Thanks for holding on, no flights found with you requested dates.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Ok, Thank you for connecting with us.