You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: Can you please book a flight ticket from DFW to IAD?

ASSISTANT: Sure, can you share me your travelling dates?

USER: Ok, my travelling dates are July 03 and July 05.

ASSISTANT: Do you have any class preference?

USER: I need a ticket in business class.

ASSISTANT: Please mention if you have any other specifications.

USER: I want a connecting flight.

ASSISTANT: Your good name please.

USER: My name is Janet Roberts.

ASSISTANT: Sorry to inform this, no flights are found on your travelling dates.

USER: Ok, thank you for the response.

ASSISTANT: Thank you for opting us.