You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I serve you today?

USER: I want to book a flight ticket to Seattle with price under 500. Can you help me with it?

ASSISTANT: Sure, may I know your source and destination?

USER: Source is LAS and destination airport code is SEA.

ASSISTANT: Can you please share your travelling dates?

USER: Travelling dates are 10/29 and 10/31.

ASSISTANT: May I know your good name please?

USER: My name is Anna Johnson.

ASSISTANT: Thanks for providing your good name. Sorry to say that, no flights were found with your given details.

USER: Ok, no issues. Thanks for the help.

ASSISTANT: Thanks for connecting with us.