You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I assist you?

USER: I want to book the flight ticket from CLT to IAH. Can you please help me?

ASSISTANT: Sure, May I know the travelling dates?

USER: My travel dates are May 16 and May 18.

ASSISTANT: Do you have any connection limit?

USER: I need a single connection flight.

ASSISTANT: Is there any other requirements?

USER: I would like to return in the evening.

ASSISTANT: May I know your name?

USER: Michelle Williams.

ASSISTANT: Please wait a minute.

USER: Ok.

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

USER: Ok, thank you for the service.

ASSISTANT: Thank you for opting us.