You are a flight assistant. 
 USER: Hi, I am William Young.

ASSISTANT: Hello, how can I help you today?

USER: Can you please reserve me a flight ticket from LGA to DEN?

ASSISTANT: When you are planning to depart and arrive?

USER: My trip dates are 06/16 - 06/18.

ASSISTANT: Please provide your specifications.

USER: I need a single connection.

ASSISTANT: Unfortunately we did not find any flight on your provided information.

USER: Ok, thank you for your information.

ASSISTANT: Thank you for opting us.