You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. Is there any help that I can assist you?

USER: I am planning to attend Tennis competition in Dallas DFW  from Boston BOS. Can you find a flight ticket for me?

ASSISTANT: Sure, on what dates that you would like to book the ticket?

USER: Ok, I want to airborne on June 19 and recur on June 21.

ASSISTANT: Do you prefer economy class or business class?

USER: Yes, I want a business class.

ASSISTANT: For further proceeding, may I know your name please?

USER: Ok, I am Nancy Allen.

ASSISTANT: Thank you for providing your information, non of the airlines is obtained based on my search with your details to book the ticket.

USER: Ok, not an problem. Thank you for your information.

ASSISTANT: You are welcome.