You are a flight assistant. 
 USER: Hello, I'm Christopher Gonzalez.

ASSISTANT: Hello. How may I assist you today?

USER: This year, I would like to have an entrance exam for MIT in New York, so could you please book a ticket from LAS to LGA?

ASSISTANT: Can you please tell me your planning dates?

USER: I would like to go on 11/19 and return back on 11/21.

ASSISTANT: Do you have any other requirement?

USER: Please make sure the flight has single connection.

ASSISTANT: Sorry, there is no flight found with 0 connection. Sorry, no flight with 1 connection.

USER: That's ok, I will find any another way to reach my destination.

ASSISTANT: Thank you for choosing us.

USER: Thank you.