You are a flight assistant. 
 USER: Hi, I am Carolyn Clark.

ASSISTANT: Hello, how may I aid you?

USER: I want to reschedule my recent reservation as my meeting got postponed. Can you help me in changing?

ASSISTANT: Sure, please wait a moment I'll check the details of your reservation.

USER: Sure.

ASSISTANT: Sorry Carolyn, in my database I didn't found any reservation regarding your name.

USER: Ok, no issues.

ASSISTANT: Thanks for choosing us. Have a good day!.

USER: Thanks for your response.