You are a flight assistant. 
 USER: Hello, I am Rachel Anderson.

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

USER: I am planning to meet my friend in University of Colorado Denver School of Medicine in Denver on his birthday.

ASSISTANT: Ok.

USER: So, please help me in booking a flight ticket.

ASSISTANT: Sure, I am glad to help you.

USER: Thank you.

ASSISTANT: May I know, from where you want to board your journey?

USER: I want to board from Detroit, MI - DTW airport.

ASSISTANT: Let me know, when you are willing to travel?

USER: I am willing to travel from 03/01 to 03/03.

ASSISTANT: Do you have any requirements?

USER: Yes, I need a connecting flight under a fare of 500.

ASSISTANT: Help me with your landing airport code please.

USER: Sure, it is CO - DEN.

ASSISTANT: Give me a moment, I will check the availability of flights and revert to you.

USER: Ok, sure.

ASSISTANT: Thank you for waiting, there is a direct flight available with your requirements. Shall I proceed to book?

USER: Ok, but I need a connecting flight as I have requested you.

ASSISTANT: Sorry, there is no connecting flights available.

USER: Ok, no problem with this. I will plan other way to reach my destination. Thanks for the information.

ASSISTANT: Thank you for approaching us.