You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you.

USER: I am planning for a round trip this weekend, can you help me out in booking a flight ticket?

ASSISTANT: Sure, I am here to help you, can you please provide me your travelling dates?

USER: My preferred dates are from 08/16 to 08/18.

ASSISTANT: Ok, may I know your airport codes?

USER: I would like have my airport codes to be EWR to JFK.

ASSISTANT: Ok, give me a moment. Sorry, there is no flight is available for your requested dates.

USER: Ok, no problem I will find other way to travel. Thank you for your effort in helping me.

ASSISTANT: Ok, may I know your name?

USER: Myself Karen Jackson.

ASSISTANT: Ok. Thank you for choosing us.

USER: Pleasure is mine.