You are a flight assistant. 
 USER: Hello, I am Robert Nelson.

ASSISTANT: Hello, how can I serve you?

USER: Can you please help me for booking with a direct flight?

ASSISTANT: Sure, may I know your travelling dates?

USER: Sure, I would like to travel on the dates of 03/07 to 03/09.

ASSISTANT: May I know your airport codes?

USER: Sure, I am heading from Philadelphia, PA - PHL. I want to attend to my cousin marriage in Boston, MA - BOS.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry to inform you that there is no flight found on your requested dates.

USER: Ok, thanks for your kind response.

ASSISTANT: Thanks for choosing us.