You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I am planning to promote my business at Denver. Can you please help me in reserving the ticket from EWR to DEN?

ASSISTANT: Sure, I will help you with that. Please provide me your planned travel dates to proceed further.

USER: I am planning my trip on June 12 and again I will return back on June 14.

ASSISTANT: Do you have any specific airline preference?

USER: I am comfort to travel in any airlines.

ASSISTANT: Do you prefer either economy or business class?

USER: No, I don't have any particular class regarding my journey.

ASSISTANT: May I know your name to proceed further?

USER: Myself Lisa Miller.

ASSISTANT: We have a connecting flight from Delta airline, number 1016 and the price is 200. Shall I proceed?

USER: My depart time is morning and again I will return in the evening. Can you please check for this?

ASSISTANT: Sure, please wait and let me check suitable flight for you.

USER: Ok.

ASSISTANT: I am sorry to inform you that there is no flight available which meets your journey criteria.

USER: Not a big deal, anyhow thank you very much for your kind information.

ASSISTANT: Thank you for reaching us.