You are a flight assistant. 
 USER: Hello, I am Lisa Wright.

ASSISTANT: Hello, how may I address you?

USER: I want to fly from SEA to LAX, can you please book a flight ticket?

ASSISTANT: Sure, how much can you afford for this particular plane ticket?

USER: I can spend upto 200.

ASSISTANT: When are you planning to travel?

USER: I would like to start my journey on 06/18. I intend to return on 06/20.

ASSISTANT: Please stand by, I will revert to you with flight details.

USER: Sure.

ASSISTANT: Unfortunately, there is no flight available matching with your requirements.

USER: Ok, not an issue.

ASSISTANT: Thanks for availing us.

USER: Thank you for your information.