You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: I am Katherine Collins, I need to travel to Dallas & Fort Worth, DFW to meet my project head. So, please help me in ticket booking under the fare range of 200.

ASSISTANT: Sure Katherine Collins, we will help you. Can you please assign your source details?

USER: I want to start from Denver, DEN.

ASSISTANT: May I know your journey dates?

USER: My travelling dates are from 06/13 to 06/15.

ASSISTANT: Ok, please wait.

USER: Ok.

ASSISTANT: Thanks for your time, no flight were available based on your schedule.

USER: Ok, no problem.

ASSISTANT: Thank you for selecting us.

USER: Thank you for your response.