You are a flight assistant. 
 USER: Hello. I am Anthony Young.

ASSISTANT: Hello, How can I assist you?

USER: I would like to travel from Detroit to Philadelphia to enjoy the fun filled vacations.

ASSISTANT: oK.

USER: Can you please reserve me a flight ticket?

ASSISTANT: Sure. May I know your travelling dates?

USER: I am planning to depart on Apr 15 and return on Apr 17.

ASSISTANT: Do you have any preferences?

USER: There should be a lay by in between my journey.

ASSISTANT: Thanks for your details, Please standby.

USER: Sure.

ASSISTANT: Thanks for waiting, there are no flights found on your data.

USER: Ok, no problem. Thank you for the information.

ASSISTANT: Thank you.