You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you at this moment?

USER: I am Christopher Turner. I am looking for a flight from HOU to PHL, can you please help me out?

ASSISTANT: Sure, I will help you. Please send your travelling dates.

USER: My travelling dates are May 28 and May 30.

ASSISTANT: Do you have any preferences?

USER: I need a direct flight.

ASSISTANT: Sorry, there is no flight available on your requested dates.

USER: That's ok, thank you for checking.

ASSISTANT: You are welcome,. have a nice day.