You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Myself James Gonzalez.

ASSISTANT: James, how may I aid you?

USER: I am planning for a round trip with my brother, could you please help me to book my flight ticket from DEN to DEN?

ASSISTANT: Sure, please provide your travel dates.

USER: Sure, I will start my journey on 04/27 and return on 04/29.

ASSISTANT: Please give me a moment to check for any available flight.

USER: Sure, take your time.

ASSISTANT: Spirit airlines with flight 1015 is available.

USER: That's perfect, you can book the ticket for me.

ASSISTANT: Your ticket is confirmed.

USER: Thank you very much for helping me.

ASSISTANT: Thank you for reaching us.