You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you?

USER: My name is Anthony Campbell. Please help me to book a flight ticket from JFK to IAH.

ASSISTANT: Sure, can you share your trip dates?

USER: My trip dates are from June, 25 to June, 27.

ASSISTANT: Do you have any preferences?

USER: I need to return in the evening and I need a single connecting flight.

ASSISTANT: Do you have any specifications?

USER: No.

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

USER: No problem, thanks for your information.

ASSISTANT: Thank you for opting us.