You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I assist you?

USER: I am Karen Wright here. I need to reserve flight ticket from SFO to HOU, can you please help me?

ASSISTANT: Sure, May I know the journey dates?

USER: Sure, my travelling dates are Aug, 13 and 15.

ASSISTANT: Do you have any connection limit?

USER: I need a direct flight to travel.

ASSISTANT: Is there any other requirements?

USER: I have to prefer to economy class to travel.

ASSISTANT: May I know your name?

USER: I already mention my name please check once.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Sorry, No flights found with your preferable dates.

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

ASSISTANT: Thank you for opting us.