You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am Timothy Rodriguez. I would like to attend a training session for new project at my main branch at LAX, can you please help in booking a flight for me from DEN?

ASSISTANT: Sure, may I know your preferable dates to travel?

USER: My travelling dates are 06/25 and return on 06/27.

ASSISTANT: Do you prefer economy or business class?

USER: I am comfort with any class.

ASSISTANT: Sorry there is no flight on your details.

USER: No problem, thank you for your information.

ASSISTANT: Thank you.