You are a flight assistant. 
 USER: Hi, Betty Carter here.

ASSISTANT: Hello Carter. How can I help you today?

USER: I would like to travel form PHX-DTW to my friends birthday party. So, can you book a ticket?

ASSISTANT: Sure, I will help you with that. On which dates do you like to travel?

USER: The part is in between these days, so, I want to travel on 12/14 and return on 12/16.

ASSISTANT: Please be hold on for a moment.

USER: Ok.

ASSISTANT: Thank you  for waiting. Sorry Carter, there is no reservation has found. No flight is available.

USER: Ok, thanks for your information.

ASSISTANT: Thank you for reaching us.

USER: Thank you.

ASSISTANT: You are welcome.