You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you today?

USER: I would like to change my existing reservation, because clients meeting was changed to other city. So, please help me with this.

ASSISTANT: Sure, I will help you.

USER: Ok.

ASSISTANT: Let me know your good name please?

USER: I am Jerry Lewis.

ASSISTANT: Thanks for providing your name, we found a reservation with your name to change.

USER: Ok.

ASSISTANT: Let me know your new journey details?

USER: Sure. I have to travel from Los Angeles, LAX to LAS, Las Vegas. My scheduled dates to travel are 10/12 to 10/14. I need a connecting flight.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, no flights are available with your journey details.

USER: Ok. Thanks.

ASSISTANT: Thanks for opting us.