You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I assist you now?

USER: Can you please help me in booking my flight ticket from ORD to LAS?

ASSISTANT: Sure, please share me your planned journey dates?

USER: My planned travel dates are July 21-23.

ASSISTANT: Do you want a connecting flight?

USER: I prefer to fly in connected flight.

ASSISTANT: Is there any other requirement?

USER:  I want to travel in economy class.

ASSISTANT: May I know your good name?

USER: Myself, Robert Campbell.

ASSISTANT: Thank you for the details, sorry there is no flight found on your given journey data.

USER: Ok, no issues. Thank you for your service.

ASSISTANT: Thank you for visiting us.