You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Please book a ticket from Boston, BOS to Denver, DEN to attend for a live concert.

ASSISTANT: Sure, we are here to help you. Can you share me your travelling dates?

USER: My travelling dates are Aug 30 and Sept 1.

ASSISTANT: May I know your name?

USER: Sure, I am Melissa Clark.

ASSISTANT: Do you have any other specifications?

USER: Yes, I prefer business class.

ASSISTANT: Ok, wait for some time.

USER: Ok.

ASSISTANT: Thanks for waiting there are no flights found on your details.

USER: Ok, no worries. Thank you.

ASSISTANT: Thanks for approaching us.