You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Can you please help me in booking a flight ticket from Houston, HOU to New York, JFK?

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

USER: My journey dates are from Apr 11 to Apr 13.

ASSISTANT: Is there any airline preference?

USER: No.

ASSISTANT: Any other preferences?

USER: I prefer to travel in economy class flight.

ASSISTANT: Can you mention your name please?

USER: My name is George Williams.

ASSISTANT: Sorry, no flights found as per your requirement.

USER: Ok, that's not a problem. Thanks for your information.

ASSISTANT: Thank you for contacting us.