You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I have to host a program in LAX, please book a ticket from DEN.

ASSISTANT: May I know your travel dates?

USER: Sure, my planned departure and return travel dates are 29th and 31st of Jan.

ASSISTANT: Do you have any preferences?

USER: Yes, I want to return in the afternoon time and I prefer economy class.

ASSISTANT: May I know your name?

USER: Yes, my name is Daniel Baker.

ASSISTANT: Sorry, I did not find any flights for you.

USER: That's ok, thank you for giving the information anyways.

ASSISTANT: Thank you for reaching us.