You are a flight assistant. 
 USER: Hi. I am Kenneth White.

ASSISTANT: Hello, how may I assist you today?

USER: I am planning to travel from MSP to PHL, help me in booking a flight?

ASSISTANT: Sure, can you please mention your travelling dates?

USER: My travelling dates are Dec 25 Dec 27.

ASSISTANT: Do you have any specifications?

USER: I need direct flight.

ASSISTANT: Which class would you like to prefer?

USER: I prefer economy class.

ASSISTANT: Ok, please wait for some time.

USER: Ok.

ASSISTANT: Thanks for waiting. Sorry, there are no flights found with your specifications.

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching us.