You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I would like to book a ticket from LAS to JFK.

ASSISTANT: Sure, may I know the travelling dates?

USER: Departure date is May, 12 and return is by May, 14.

ASSISTANT: Do you have any connection limit?

USER: I would prefer connecting flight.

ASSISTANT: Is there any other requirements?

USER: I would like to return in the morning.

ASSISTANT: May I know your name?

USER: My name is Timothy Lee.

ASSISTANT: Please wait a minute.

USER: Ok.

ASSISTANT: Sorry, no flights found with your chosen dates.

USER: Thank you.

ASSISTANT: Thank you for opting us.