You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Can you aid me to book my ticket from LAX to DEN?

ASSISTANT: Please provide your travelling dates?

USER: My trip dates are Aug 27 and Aug 29.

ASSISTANT: Is there any preference?

USER: I prefer for connecting flight and economy class to travel.

ASSISTANT: May I know your name?

USER: Ashley Lopez here.

ASSISTANT: Ok. I regret there are no flights for your travelling dates.

USER: Thank you for the help.

ASSISTANT: Thanks. Have nice day!.