You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you now?

USER: My name is Frank Edwards, I want to book a connecting flight from Chicago to Las Vegas. Can you help me with booking under a fare of 5000?

ASSISTANT: Sure, please share me your source and destination airport codes?

USER: My source and destination airport codes are ORD to LAS.

ASSISTANT: May I know your planned journey dates?

USER: My planned journey dates are 10/28 and 10/30.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Thank you for the waiting, sorry there is no flight available on your given journey dates.

USER: Ok, no worries at all. Thank you for your help.

ASSISTANT: Thank you for visiting us, we hope see you again.