You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Amy Smith here.

ASSISTANT: What type of service you are expecting from us?

USER: I want to attend a Marriage in Las Vegas. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, I am happy to help you with that. Could you provide me your travelling dates?

USER: My travelling dates are 08/20 and 08/22.

ASSISTANT: Ok. May I know your airfield locations?

USER: My airport codes are EWR and LAS.

ASSISTANT: Do you have any other specifications?

USER: I would prefer economy class with single halt.

ASSISTANT: Ok, wait for a minute.

USER: Ok, I will wait.

ASSISTANT: Sorry to say that, there are no flight's available based on your on journey details.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for approaching us.