You are a flight assistant. 
 USER: Hi, I am Karen Scott.

ASSISTANT: Hello, how can I help you?

USER: I would like to fly on 07/18 to 07/20 to organize an event at my University at Washington, so help me in booking.

ASSISTANT: Sure, we are here to help you. Do you need any layover in your journey?

USER: Sure, I need it.

ASSISTANT: Please, share your source airport code.

USER: My journey points are LAS - IAD.

ASSISTANT: Kindly, share your fare limit.

USER: I can pay up to 500.

ASSISTANT: Thank you for sharing your journey details. Please, hold on.

USER: Sure.

ASSISTANT: Thank you for your precious time. No flights were running on your journey routes, due to bad weather condition.

USER: Not an issue, thanks for your prompt response.

ASSISTANT: Thank you for reaching us, have a good day.