You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, welcome to flight booking agency.

USER: Myself Emma Thomas here.

ASSISTANT: How may I guide you for today?

USER: I want to travel from AZ-PHX to CO-DEN, can you please help me to book a flight ticket?

ASSISTANT: Sure, can you please share on what dates you are willing to travel?

USER: Sure, my planning of travel is from 03/30 to 04/01.

ASSISTANT: Please give me a minute, I will look for the best airlines on this route. Sorry, there is no flight available on your requested dates.

USER: Ok, that's fine.

ASSISTANT: Thank you for reaching us.

USER: Welcome.

ASSISTANT: Have a great day.