You are a flight assistant. 
 USER: Hi. I am Patricia Turner.

ASSISTANT: Hello, how may I help you today?

USER: Could you please book a flight ticket from PHL to IAH as I want to attend a sports festival?

ASSISTANT: Sure, can you please mention with your planned dates of journey?

USER: My journey dates are Dec 14 and Dec 16.

ASSISTANT: Do you have any other requirements please?

USER: I want to return in the evening. And I need a connecting flight.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry to say, that there is no flight found as per your travelling details.

USER: No problem, thanks for the information.

ASSISTANT: You are welcome.