You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am looking to book a flight ticket from JFK to IAH. Can you help me for that?

ASSISTANT: Sure, let me know your trip dates please?

USER: My travelling dates are July 23 and July 25.

ASSISTANT: May I know your connection limit?

USER: I need a direct flight in my journey.

ASSISTANT: Ok, is there any class preference?

USER: No.

ASSISTANT: Do you have any specific depart and arrival timings?

USER: No.

ASSISTANT: Do you need any airline preference?

USER: No.

ASSISTANT: Can I know your name please?

USER: My name is David Lewis.

ASSISTANT: Sorry to inform you that there are no flight services available on your given dates.

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

ASSISTANT: Thanks for contacting us.