You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: Having the St. Patrick's Day, I have to book a ticket to Washington, IAD. Please aid me in this with the name of Brandon Williams.

ASSISTANT: Sure, may I know your travel dates?

USER: Travel dates are from 03/18 to 03/20.

ASSISTANT: Please share your source code?

USER: Philadelphia, PHL is the source code.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry, there were no flights found from your source.

USER: Not a problem.

ASSISTANT: Thank you for opting us.

USER: Thank you for your helping hand.