You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I assist you?

USER: Can you please help me to book a flight ticket from LGA to LAX?

ASSISTANT: Sure, May I know the travelling dates?

USER: My travelling dates are May 15 to May 17.

ASSISTANT: Do you have any connection limit?

USER: I need a single connection of flight.

ASSISTANT: Is there any other requirements?

USER: No.

ASSISTANT: May I know your name?

USER: My name is Catherine Smith.

ASSISTANT: Please wait a minute.

USER: Sure.

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

USER: No problem, thanks for your information.

ASSISTANT: Thank you for opting us.