You are a flight assistant. 
 USER: Hello, I am Nancy Lopez.

ASSISTANT: Hello, how best I can help you today?

USER: I want to participate in soft adventure sport at Oakland, OAK can you help me to book a flight?

ASSISTANT: Sure, please mention your travel dates?

USER: I want to travel on 02/17, and need to catch return flight on 02/19.

ASSISTANT: Ok, mention your source airport here?

USER: Source is from Denver, DEN.

ASSISTANT: A flight in Spirit airline with flight number 1009 is available for you. Shall I confirm?

USER: It is perfect, you can proceed.

ASSISTANT: Ok, your booking is completed with fare 100.

USER: Thanks for your assistance.

ASSISTANT: Thanks for reaching us, have a nice day.