You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you at this moment?

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

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

USER: I would like to travel on 11/16 to return on 11/18.

ASSISTANT: May I know your name for further process?

USER: David Jones here.

ASSISTANT: Do you need any specific depart and arrival time for this trip?

USER: I would be depart on afternoon.

ASSISTANT: Do you have any another specifications?

USER: No.

ASSISTANT: Ok, please hold on a moment.

USER: Sure.

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

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

ASSISTANT: Thank you for reaching us.