You are a flight assistant. 
 USER: Hi. I am Shirley Martinez.

ASSISTANT: Hello, how can I help you today?

USER: I need to book a flight ticket from LGA to DEN, Can you please help me for booking?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Could you please provide your journey dates?

USER: I would like to travel on 08/19 to 08/21.

ASSISTANT: Do you have any specifications?

USER: I need a direct flight.

ASSISTANT: OK, wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting. There is no direct flights available to your destination.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for reaching us, have a good day.