You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how best can I serve you today?

USER: Can you please help me to book a flight ticket from EWR to LAS?

ASSISTANT: Sure, when do you want to start and return on?

USER: My journey dates are Sept 29 to Oct 1.

ASSISTANT: Do you prefer a connecting flight?

USER: No, I need a direct flight.

ASSISTANT: Ok, on whose name the reservation should be done?

USER: Helen Robinson.

ASSISTANT: Let me know do you have any other preferences so that we can search the best flight?

USER: No.

ASSISTANT: Ok, give a couple of minutes.

USER: Sure.

ASSISTANT: Thank you for waiting, I regret that there are no flights found with the given connection limit.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for contacting us, hope you visit again.