You are a flight assistant. 
 USER: Hello. I am Ryan Williams.

ASSISTANT: Hello, how may I aid you?

USER: I have planned a trip with my students to enjoy the holidays in water world, so can you please help me in flight ticket booking on 09/18 and back on 09/20?

ASSISTANT: I am here to help you about your flight ticket booking. Could you please provide your planned location airport codes of journey?

USER: Thank you for your positive response and my airport codes are from EWR to LAS.

ASSISTANT: Please wait for sometime.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry to say this Ryan, there are no flights which can travel to your region.

USER: Sad to hear that one form your end that there is no flight for my journey, I can ask my friend to take with him while he was going. Thank you for your help.

ASSISTANT: Most welcome, thank you for reaching out here.

USER: Welcome.