You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Kenneth Green.

ASSISTANT: How can I assist you at this moment?

USER: Can you please help me to book a flight ticket from Boston-BOS to Phoenix-PHX?

ASSISTANT: Sure Kenneth Green, I will help you with that. Can I have your travel dates please?

USER: Thank you. I am willing to travel on the dates of Mar 04 and Mar 06.

ASSISTANT: Ok, please wait a moment.

USER: Ok, please make sure that the returning time is evening.

ASSISTANT: Sorry Kenneth Green, no flight is available to you as per your timings.

USER: It's ok, not a problem with that. Anyways thank you for your help.

ASSISTANT: Thank you for choosing us, have a good day.