You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I am planning to attend LGBT festival at LGA, can you help me with booking a direct flight?

ASSISTANT: Sure, may I know your boarding point?

USER: My boarding point is HOU.

ASSISTANT: Can you please share your planned travel dates?

USER: My travel dates are June 21 and June 23.

ASSISTANT: Is there any class preference?

USER: I want to travel in economy class.

ASSISTANT: May I know your name please?

USER:  I am Patrick Nelson.

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

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for opting us.,.