You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can you please make a reservation from PHL to IAH to attend a meeting in Houston?

ASSISTANT: Sure, may I know your trip dates please?

USER: My journey start on May 27th, and return back on May 29th.

ASSISTANT: Do you have any other requirements?

USER: I prefer a economy class in my journey. And I need a break in between journey.

ASSISTANT: Can I know your name please?

USER: My name is Rachel Scott.

ASSISTANT: Sorry, we regret to inform you that there is no flight available as per your request.

USER: Ok, no problem, I will try with another agency. Anyway, thank you.

ASSISTANT: Most welcome.