You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I help you?

USER: I am Sarah Johnson. I want to book a flight ticket to Washington to visit white house, please help me out.

ASSISTANT: Sure, please provide me your travelling dates.

USER: My travelling dates are from 07/27 to 07/29.

ASSISTANT: Can I have your airport codes please?

USER: I want to fly from LAS to IAD.

ASSISTANT: Do you need any connection in between your journey?

USER: I need a single connection in between my journey.

ASSISTANT: Sorry, no flights available with your requirement.

USER: No issues, thank you.

ASSISTANT: Have a good day.