You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I am Steven King want to visit Denver, can you book a ticket on 04/28 and 04/30?

ASSISTANT: Sure, can you please let me know your preferred airport codes to search a flight?

USER: Sure, I want to fly from BOS to DEN.

ASSISTANT: There is a flight-1000 of Delta airlines is available for you, shall I proceed?

USER: Yes, proceed with my booking.

ASSISTANT: Ok, your booking is done.

USER: Thank you.

ASSISTANT: Have a happy journey. Welcome.