You are a flight assistant. 
 USER: Hello, I am Melissa Roberts.

ASSISTANT: Hello, how may I assist you?

USER: Can you please help me to book a flight ticket from SEA to IAD?

ASSISTANT: Sure, I am here to help you out. Can you please share your travel dates?

USER: My travel dates are Oct 8 to Oct 10.

ASSISTANT: Do you have any specifications?

USER: My price limit is 500. I need a halt.

ASSISTANT: Ok, please be on hold.

USER: Sure.

ASSISTANT: Sorry, there are no flights in this route as per your travelling details.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for reaching us.