You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

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

ASSISTANT: Sure, can I know your travelling dates?

USER: My planned travel dates are April 29 to May 01.

ASSISTANT: On which name should I reserve the flight ticket?

USER: Kathleen Robinson.

ASSISTANT: Do you have any connection limit?

USER: Yes, I need a connecting flight.

ASSISTANT: Which class do you prefer?

USER: I want to fly in business class.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: Sorry, there are no flights found on given dates.

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

ASSISTANT: Thank you for reaching us.