You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I want to book a flight ticket from ORD to PHX. Can you help me in that?

ASSISTANT: Sure, may I know your travel dates?

USER: My trip dates are Dec 07 to Dec 09.

ASSISTANT: Do you have any specifications?

USER: My return should be in the afternoon.

ASSISTANT: Please share me your name.

USER: Gregory Robinson here. I need to travel in a connecting flight.

ASSISTANT: Sorry, there is no flight right now.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you.