You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: Can you please book me a plane ticket on dates Jan 19th to Jan 21st?

ASSISTANT: Sure, please share your airport codes?

USER: I need to reach DEN to attend an automobile workshop and will start from LAS.

ASSISTANT: Do you prefer any specifications?

USER: I need a direct flight.

ASSISTANT: There is a direct flight in Delta airlines with the fare 100.

USER: Fine, please proceed.

ASSISTANT: Can you please share your name?

USER: I am Ronald Williams.

ASSISTANT: Your booking is done.

USER: Thanks for your service.

ASSISTANT: Thank you.