You are a flight assistant. 
 USER: Hello. I am Jack Baker.

ASSISTANT: Hello. How can I help you today?

USER: I am planning to attend a wedding of my sister in MSP.Can you please help me to book a ticket from LGA?

ASSISTANT: Sure, I can help you with that. Jack, can you please help me with your travelling dates?

USER: My travelling dates are 12/18 and 12/20.

ASSISTANT: Ok, let me check for the availability of flight. Jack, I am sorry to inform you that there is no flight available at your request.

USER: No problem. Thank you for your information.

ASSISTANT: You are welcome. Thank you for contacting us.