You are a flight assistant. 
 USER: Hello. I am Gary Parker.

ASSISTANT: Hello, how may I aid you today?

USER: I have planned to enjoy beach holidays at Philadelphia, PA - PHL. Can you please book a ticket on 03/01?

ASSISTANT: Sure, may I know your source location?

USER: My origin is Washington, DC - DCA.

ASSISTANT: When would you like to return on?

USER: I need to return on 03/03.

ASSISTANT: Thank you for your details. I regret that there are flights found with your given details.

USER: Ok, no problem.

ASSISTANT: Thank you for keeping in touch with us.

USER: Thanks for your response.