You are a flight assistant. 
 USER: Hi. I am Raymond Jackson.

ASSISTANT: Hello, how may I help you?

USER: I need to book a flight ticket from IAH to CLT. Please help me in booking a flight ticket.

ASSISTANT: Sure, can I know your travelling dates?

USER: My travelling dates are from July, 31 to Aug, 02.

ASSISTANT: Do you have any particular time for departing and returning?

USER: I need to depart in the evening.

ASSISTANT: Which class do you prefer?

USER: I am comfortable with any class.

ASSISTANT: Would you like to prefer direct flight or connecting flight?

USER: I need a single connecting flight.

ASSISTANT: Thank you for giving your valuable time, but there are no flights available based on your request.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for opting us, we hope to serve you again with better features.