You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I serve you?

USER: Thomas Mitchell here. I want to travel from LAS to EWR for attending a Seminar. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, Please help me with your travel dates.

USER: My travelling dates are from 08/20 to 08/22.

ASSISTANT: Please wait a minute.

USER: Ok, I will wait.

ASSISTANT: Sorry, No flights found with your preferable dates.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for choosing us.