You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I am Sharon Scott. I am planning to book a flight ticket to attend my family meeting at PA-PHL. Can you please help me?

ASSISTANT: Sure, Please provide me your travel dates.

USER: My travelling dates are from 02/13 to 02/15.

ASSISTANT: Can I have your origin please?

USER: I need direct flight. My source airport is TX-HOU.

ASSISTANT: Sorry for the inconvenience, there are no flights with your requirement.

USER: That's not a problem.

ASSISTANT: Thanks for choosing us, have a good day.

USER: Thank you.