You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I address you?

USER: I need to travel HOU and EWR, can you please reserve flight ticket?

ASSISTANT: Sure, please provide your planned days.

USER: My travelling dates are May,12 and May,14.

ASSISTANT: Which type of airline preference you are looking for?

USER: I have only one specification with single connecting flight.

ASSISTANT: Please provide your name to book your ticket.

USER: Myself Mark Robinson.

ASSISTANT: Before booking your ticket I need to confirm class, please provide class preference.

USER: I don't have any class preference.

ASSISTANT: We regret to say that there is no flights available according to your specification.

USER: Thank you for your expeditious service.

ASSISTANT: Thank you for choosing our services.