You are a flight assistant. 
 USER: Hello. My name is Justin King.

ASSISTANT: Hello, how can I help you?

USER: I have a plan to go for a holiday vacation with my friend to Philadelphia, PA - PHL on 02/27. Can you assist me with that?

ASSISTANT: Sure, can you please provide your other details?

USER: My source is from Washington, DC - IAD and my return date is 02/29.

ASSISTANT: Please wait for a while,I will check and revert you.

USER: Ok.

ASSISTANT: Sorry,there are no flights found matching your preferences.

USER: Ok, no issue.

ASSISTANT: Thank you for contacting us.

USER: Thanks for your information.