You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

USER: I am Lisa Perez, can you help me to book a flight from LGA?

ASSISTANT: Sure, can you please share your travel dates?

USER: I am planning to fly on 08/18 and 08/20.

ASSISTANT: Could you please help me with the destination airport code?

USER: My preferred destination airport code is DEN.

ASSISTANT: Let me check for the availability of flight.

USER: I need a connecting flight.

ASSISTANT: Lisa, I am sorry to inform you that there is no flight available at your request.

USER: Ok, no issues. Thank you for your help.

ASSISTANT: Thank you for contacting us, have a great day.