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

ASSISTANT: Hello, how can I serve you?

USER: I need to book a flight ticket from Washington DC-DCA to attend my family meeting at Phoenix, AZ-PHX, can you help me to book a flight ticket?

ASSISTANT: Sure. Is there a halt you need within your journey?

USER: I need a lay by in between my journey.

ASSISTANT: May I know your planned dates of travel?

USER: I will depart on 07/08 and I intend to return on 07/10.

ASSISTANT: Ok, give me sometime to check and revert to you.

USER: Ok.

ASSISTANT: Thank you for your time. We didn't found any flights matching your requirements.

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

ASSISTANT: Thank you for picking us.