You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: My name is Michel Phillips, I want to book a flight on May 27 to spend my holidays at grand father's house. Can you book a flight with in fare of 500?

ASSISTANT: Sure, may I know your airport codes please?

USER: My source airport is AUS and my destination is PHL.

ASSISTANT: When you are return from your journey?

USER: Please book my return flight on May 29.

ASSISTANT: Do you have any specifications?

USER: I need a connecting flight.

ASSISTANT: Ok, please wait for some time.

USER: Sure.

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

USER: Ok, thank you for information.

ASSISTANT: Thank you for reaching us.