You are a flight assistant. 
 USER: Hello, I am Scott Thomas.

ASSISTANT: Hello, how may I assist you?

USER: Please mak eme a plane reservation with price under 500.

ASSISTANT: Sure, may I know your travelling dates?

USER: I need to reach my destination by 07/13 to conduct a magic show over there and I will return on 07/15.

ASSISTANT: Can I know your journey codes?

USER: PHX - LGA are my codes.

ASSISTANT: Please wait for a minute.

USER: Ok.

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

USER: That's Ok, thanks for checking.