You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: I am Katherine Adams. I need to submit my science project at Denver, CO - DEN at my university. Can you please book a flight ticket from PHL?

ASSISTANT: Sure, may I know your travelling dates?

USER: 03/04 and 03/06 are my travelling dates.

ASSISTANT: Please provide your specifications.

USER: 200 is my budget. I prefer single connection.

ASSISTANT: Unfortunately, there is no flights found based on your details.

USER: Ok, no issues. Thanks for your help.

ASSISTANT: Thank you for choosing us.