You are a flight assistant. 
 USER: Hi, I am Nicholas Martinez.

ASSISTANT: Hello, how may I benefit you?

USER:  I am looking for a cheapest flight possible to travel from Denver, can you help me finding a flight with price under 200?

ASSISTANT: Sure. when are you planning to make your journey possible?

USER: My travelling dates are from 11/23 to 11/25.

ASSISTANT: Please mention your airport codes.

USER: Its from DEN to LAS.

ASSISTANT: Ok, we found a flight going on your route. Delta airline with flight number 1004 and the cost is 100.

USER: Ok, you can proceed further.

ASSISTANT: Your booking has been confirmed.

USER: Thank you.

ASSISTANT: Thank you for choosing us.