You are a flight assistant. 
 USER: Hello, Jonathan Smith here.

ASSISTANT: Hello Jonathan Smith. How can I help you today?

USER: I have planned to celebrate my grandparents 60th anniversary in Houston, TX - IAH on 06/05. I want to reserve a tiicket from Philadelphia, PA - PHL on 06/03.

ASSISTANT: Ok, may I know your arrival date and origin point? Sure, wait for a while, I will revert you.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no flight found with your specifications.

USER: Ok, no issue. Thank you for your service.

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