You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you?

USER: I want to enter into the Marketing business field, So I want to attend Marketing and Business Development Conference. Can you book me a flight ticket?

ASSISTANT: Sure, is there any connection limit?

USER: No, I am looking for a direct flight.

ASSISTANT: Ok, can you please provide your airport codes?

USER: My preferable airport codes are LGA and LAS.

ASSISTANT: May I know your travelling dates please?

USER: I want to start on Apr 9th and return on Apr 11th.

ASSISTANT: Can I have your name please?

USER: Anthony Harris is my name.

ASSISTANT: Sorry, there are no flights found with your given information.

USER: That's ok, not an issue. Thanks for your kind information.

ASSISTANT: Thanks for opting us.