You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Scott Green from Seattle.

ASSISTANT: How can I help you today?

USER: I would like to visit Dallas in this week. Can you please book a flight ticket for me?

ASSISTANT: Ok, please tell me your travel dates.

USER: Thank you for your positive response, I want to take off on 12/02 and please confirm my return ticket also on 12/04.

ASSISTANT: May I know your airport codes please?

USER: I want to fly from SEA and destination airport is DFW.

ASSISTANT: Please wait for a moment.

USER: Ok, take your time and find a best flight for me.

ASSISTANT: Sorry Green, there is no flight available on your route.

USER: Oh! It's ok no problem, I will contact another airline agency. Thank you for your information.

ASSISTANT: Thank you.