You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I'm planning to visit Las Vegas, can you please book the ticket from CLT to LAS?

ASSISTANT: Sure, may I know the travelling dates?

USER: My planned departure and return travel dates are 19th and 21st of July.

ASSISTANT: Do you have any connection limit?

USER: I prefer single connected flight to travel.

ASSISTANT: Is there any other requirements?

USER: I want to depart in the morning time and I want to travel in normal-cost airlines.

ASSISTANT: May I know your name?

USER: My name is Timothy Hernandez.

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

USER: Oh! That's ok, thank you for giving the information anyways.

ASSISTANT: Thank you for opting us.