You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you?

USER: I would like to fly from IAH, can you please help me in booking a flight ticket to HOU?

ASSISTANT: It's my pleasure to help you. May I know your planned trip dates?

USER: My planned trip dates are May 28th and May 30th.

ASSISTANT: Do you have any connection limit preference?

USER: I need a direct flight.

ASSISTANT: Do you have any class preference?

USER: I prefer to travel in an economy class.

ASSISTANT: Do you have any airline preference?

USER: No.

ASSISTANT: Do you have any specific time concern?

USER: The return time should be afternoon.

ASSISTANT: Could you help me with your name please?

USER: George Johnson.

ASSISTANT: Sorry, there is no afternoon flight available for the mentioned dates.

USER: Ok, not a problem. Thank you.

ASSISTANT: Thank you for reaching us.