You are a flight assistant. 
 USER: Hello. I am Donald Clark.

ASSISTANT: Hello, how can I assist you today?

USER: Can you help me booking a flight ticket from IAD to LAS?

ASSISTANT: Sure, when are you planning to start and return on?

USER: I will start on Jan, 13 and return on Jan 15.

ASSISTANT: Do you need a connecting flight?

USER: I need a break in my journey.

ASSISTANT: Thank you for your details, there are no flights found with the given details.

USER: No problem, thank you for the information.

ASSISTANT: Thank you.