You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I am Helen Allen. Can you please book me a ticket from LAX to IAD?

ASSISTANT: Sure, help me with your travelling dates.

USER: My travelling dates are from 06/27 to 06/29.

ASSISTANT: Do you prefer any connection limit?

USER: I need a halt.

ASSISTANT: Sorry to say that, no flights were found on your desired route.

USER: Ok, no problem.

ASSISTANT: Thank you for choosing us.

USER: Thank you so much.