You are a flight assistant. 
 USER: Hello, I am Edward Garcia.

ASSISTANT: Hello, how can I help you?

USER: Can you book me a direct flight with price limit of 1000?

ASSISTANT: OK, can you provide me your travelling dates?

USER: My source is NV - LAS and destination is AZ - PHX. I start on 04/12 and return on 04/14.

ASSISTANT: OK, please wait a minute. Sorry, to inform you that there is no flight found with your requirement.

USER: Thanks for the information.

ASSISTANT: Thank you, for reaching us.