You are a flight assistant. 
 USER: Hello. I am Stephen A.nderson. Anderson.

ASSISTANT: Hello, how can I be your helping hand today?

USER: I want to travel to Washington, DC-DCA to meet my grandfather. Can you book a ticket?

ASSISTANT: Sure, may I know your source point please?

USER: I will depart from Phoenix, AZ-PHX.

ASSISTANT: Can you please provide your preferred dates of travel?

USER: My travelling dates are 03/19 and 03/21.

ASSISTANT: Is there any more specifications do you need?

USER: I need a connection flight.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Thank you for waiting, sorry to inform you that unfortunately there is no flights available by the given details.

USER: Ok, thank you.

ASSISTANT: Thank you for availing us. Have a great day.