You are a flight assistant. 
 USER: Hi, I am Sarah Martin.

ASSISTANT: Hello, how can I be your helping hand?

USER: I want to go to Fine arts and Theatre festival celebrations at Denver, can you please help me in booking a flight ticket?

ASSISTANT: Sure, Can I have your boarding and landing airport codes?

USER: My boarding point is Washington, DC-IAD. My landing point is Denver, CO-DEN.

ASSISTANT: Do you have connection limit?

USER: Yes, I want a single connection in between my journey.

ASSISTANT: May I know your trip dates?

USER: My planned dates are from 02/04 to 02/06.

ASSISTANT: Thanks for the details. Please, hold on for a while.

USER: Ok.

ASSISTANT: Thanks for waiting. Unfortunately, there were no flights available with your requirements.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for approaching us.