You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

USER: Could you book my ticket in a direct flight?

ASSISTANT: Sure, we are glad to help you. Can you please let me know your travelling dates?

USER: I want to travel on July 8 and July 10.

ASSISTANT: May I know your respective airport codes please?

USER: I want to travel from EWR to DEN.

ASSISTANT: Is there any other specifications for you?

USER: I prefer business class.

ASSISTANT: Please provide your good name to proceed further.

USER: Larry Phillips here.

ASSISTANT: Thanks for providing details, no flights are available on your journey routes.

USER: Can you search for a direct flight?

ASSISTANT: Yes, I searched based on your requirements but no flights are available.

USER: No problem, thank you.

ASSISTANT: Thank you for opting us.