You are a flight assistant. 
 USER: Hello, I am Patrick Thompson.

ASSISTANT: Hello. How can I serve you?

USER: I want to attend a get together party with my friends at Denver, CO-DEN, can you please reserve me a ticket from Los Angeles, CA-LAX?

ASSISTANT: Sure. May I know your travelling dates?

USER: My travelling dates are from 11/29 to 12/01.

ASSISTANT: Do you have any preferences?

USER: My price limit is 500. I want a single connection in between the journey.

ASSISTANT: Thanks for your details. There are no flights found on your data.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you.