You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, may I know your good name?

USER: My name is Raymond Allen.

ASSISTANT: How can I assist you today?

USER: I want to book a flight ticket with a price limit of 1000 for visiting a Space Needle in Seattle.

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

USER: My source is Houston, TX - HOU. My destination is Seattle, WA - SEA.

ASSISTANT: Please provide me your travelling dates.

USER: I will start on 03/31, return on 04/02.

ASSISTANT: May I know your connection limit?

USER: I want direct flight.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, sorry to say that, no flights were found with your given details.

USER: No problem, thank you.

ASSISTANT: Thanks for choosing us.