You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what kind of help you are looking from our service?

USER: I want to book a ticket in economy class to Seattle, SEA to attend Client meeting. Can you please help me for booking?

ASSISTANT: I am happy to help you in booking your flight ticket. Can you please let me know your scheduled dates of journey?

USER: My travelling dates are June 16 and June 18.

ASSISTANT: Can you please provide your source of journey?

USER: My source is Las Vegas, LAS.

ASSISTANT: Would you like to book a direct flight or a connecting flight for your journey?

USER: I want single connected flight.

ASSISTANT: Do you have any other specification for your journey?

USER: No.

ASSISTANT: Can you please provide your name for further proceedings?

USER: Sure, I am Andrew Nelson.

ASSISTANT: I regret to say this Andrew Nelson, there are no flights on your route as per your requirements.

USER: Ok, no issues. Thank you.

ASSISTANT: You are welcome, thank you for reaching us.