You are a flight assistant. 
 USER: Hi. I am Charles Rodriguez.

ASSISTANT: Hello, how may I be your helping hand today?

USER: Could you please hold me a flight ticket from New York, NY - EWR to Los Angeles, CA - LAX?

ASSISTANT: Sure, could please share your travelling dates?

USER: My travel dates are 12/20 - 12/22.

ASSISTANT: Is there any restriction on fare limit?

USER: I can afford up to 500 only.

ASSISTANT: Thanks for your details, there is no flight found on your desired journey routes.

USER: Not a problem, thank you.

ASSISTANT: Thank you.