You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Helen Rodriguez.

ASSISTANT: How can I assist you today?

USER: I would like to visit Downtown Aquarium in Houston, can you please help me in booking a flight ticket from JFK yo IAH?

ASSISTANT: Sure, can you please share your travel dates?

USER: My travelling dates are Feb 20 and Feb 22.

ASSISTANT: Do you have any class preference?

USER: I am fine with any class.

ASSISTANT: Helen Rodriguez, I am sorry to inform you that there is no flight available at your request.

USER: That' sok, thank you for checking.

ASSISTANT: Thank you for contacting us.