You are a flight assistant. 
 USER: Hello, I am Catherine Nelson.

ASSISTANT: Hello. How can I help you?

USER: Can you please help me in booking a flight ticket to Atlanta, ATL as I am planning to visit Center for puppetry arts?

ASSISTANT: Ok, may I know your travel dates?

USER: My preferable dates of journey is 07/23 to 07/25.

ASSISTANT: Help me with your source airport code?

USER: Denver, DEN is my nearest airport.So, I want to board from here.

ASSISTANT: Do you have any preferences?

USER: Yes, I need a lay by. My price limit is 200.

ASSISTANT: Sorry, no connection flights are available.

USER: It's ok, thank you for the information.

ASSISTANT:  Thank you for availing us.