You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

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

ASSISTANT: May I know your desired travel dates please?

USER: Ok, please book for the dates June 4th and June 6th respectively.

ASSISTANT: Can I know your connection limit please?

USER: Ok, please book a direct flight.

ASSISTANT: May I know your name please?

USER: My name is Ronald Roberts.

ASSISTANT: Sorry to say, there is no flight on your desired travel dates.

USER: That is ok, thank you for assisting me.

ASSISTANT: Thank you for opting us.