You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Can you help me in booking my flight ticket from PHL to DCA?

ASSISTANT: Sure, when do you want to travel?

USER: My trip dates will be Sep 25th to Sep 27th.

ASSISTANT: Ok, Do you have any class preference?

USER: I am ok, with any class.

ASSISTANT: Ok, Do you prefer direct flight or connected flight?

USER: I am prefer a direct flight.

ASSISTANT: Ok, Is there any other preferences?

USER: My depart time should be in the morning.

ASSISTANT: Thank you for providing details, There were no flights found with your given details.

USER: Its ok, thank you.

ASSISTANT: May I know your name?

USER: I am Charles Edwards.

ASSISTANT: Thank you for reaching us.