You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what can I do for you?

USER: Gary Hernandez here. Can you please book me the ticket in a non-stop flight?

ASSISTANT: I am perky to help you.

USER: My journey starts from 11/27 and ends on 11/29.

ASSISTANT: When are you planning to make your journey? Please provide your airport codes?

USER: Sure, my source and destination airport codes are PHL and ATL.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting.

USER: Ok. Did you find any flights with my given details?

ASSISTANT: Sorry there are no flights found with your specifications.

USER: Thank you.