You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I'm planning to visit Chicago, can you please book the ticket from LAS to ORD?

ASSISTANT: Sure, may I know the travelling dates?

USER: My planned departure and return travel dates are 30th April and 2nd May.

ASSISTANT: Do you have any connection limit?

USER: I prefer single connected flight to travel.

ASSISTANT: Is there any other requirements?

USER: No, I don't have any other specifications.

ASSISTANT: May I know your name?

USER: My name is Shirley Walker.

ASSISTANT: Please wait a minute.

USER: Sure, I'll wait for your response.

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

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

ASSISTANT: Thank you for opting us.