You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I need to book my ticket from LAS to EWR. Can you please help me with booking?

ASSISTANT: Sure, I will help you. Please tell us your name.

USER: Sure, myself Robert Lewis.

ASSISTANT: Thank you. Please help me with your travel dates.

USER: My planned journey dates are Aug 22 and Aug 24.

ASSISTANT: Noted. Are you looking for a connecting flight?

USER: I need a connecting flight in my journey.

ASSISTANT: Sure, please wait for a while. Sorry, there is no flight available on your preferred travel dates.

USER: Please make sure that, my depart time should be in the evening time only. That's ok, no problem. Thank you for your service.

ASSISTANT: You are most welcome and have a nice day.