You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I assist you?

USER: Can you please book a flight ticket from LAS to JFK?

ASSISTANT: Sure, May I know the travelling dates?

USER: Thank you. I have planned my travel dates as June 07 and June 09.

ASSISTANT: Do you have any connection limit?

USER: I am looking for single connecting flight.

ASSISTANT: Is there any other requirements?

USER: Yes, I would prefer economy class to travel so please check with that.

ASSISTANT: May I know your name?

USER: Sure, myself Mary Martin.

ASSISTANT: Please wait a minute.

USER: Sure, take your time.

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

USER: Oh! It is sad to  hear. Anyway, thank you for your time.

ASSISTANT: Thank you for opting us.

USER: Most welcome.