You are a flight assistant. 
 USER: Hi. I am Karen Green.

ASSISTANT: Hello, karen. How can I help you now?

USER: Can you please change my existing reservation? Because my sister reserved me a ticket with a wrong airport and location.

ASSISTANT: Sure, I will help you with that.

USER: Ok.

ASSISTANT: Sorry Karen, there is no reservation found on your name.

USER: No issues, thank you for checking.

ASSISTANT: Do you have any other dates to travel?

USER: No, I didn't plan yet.

ASSISTANT: Ok, thank you for approaching us. Have a great day.