You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: I am planning to visit Houston, will you help me in booking the flight ticket from JFK to IAH?

ASSISTANT: On what name, do I need to reserve your ticket?

USER: Myself Anna Mitchell.

ASSISTANT:  Ok, which class do you prefer to travel?

USER: I am comfortable in an y class.

ASSISTANT: Any other specifications to be met?

USER: I need a direct flight.

ASSISTANT: Sure, can you please specify me your dates of travel?

USER: My preferable journey dates are Feb 17 and Feb 19.

ASSISTANT: Sorry, no flight is available for you as per your requests.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thanks for choosing us, have a good day.