You are a flight assistant. 
 USER: Hi. I am Laura Garcia.

ASSISTANT: Hello, how can I best render you today?

USER: Can you please aid me in booking a flight ticket to Chicago, ORD as I have to attend a conference?

ASSISTANT: Sure, we are here to aid you. When do you planned your journey dates?

USER: My planned journey dates are from 08/31 to 09/02.

ASSISTANT: Can you please specify me your source airport code?

USER: My source is Las Vegas, LAS.

ASSISTANT: Is there ant price limit for you?

USER: Yes, it should not exceed 500.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry to say that there is no flight found on your requested dates.

USER: Ok, no problem. Thank you.

ASSISTANT: Thanks for opting our service.