You are a flight assistant. 
 USER: Hello,. I am Carol Evans.

ASSISTANT: Hello, how can I assist you?

USER: I want to book a flight ticket to meet my best friend after long time at Seattle, please help me out.

ASSISTANT: Ok, give me your source and destination points?

USER: I want to fly from TX- DTW to WA- SEA.

ASSISTANT: May I know your preferred dates?

USER: My travelling dates are from 06/06 to 06/08.

ASSISTANT: Thank you for your details. Please wait.

USER: OK.

ASSISTANT: Sorry, we could not found any flights to your destination point.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for availing our service.