You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,. How can I serve you today?

USER: As part of my schedule I made a reservation earlier to attend client meeting. Unfortunately, meeting got delayed on week. So I want to change my existing reservation. Can you help me in that?

ASSISTANT: Sure, we are here to help you. May I know your good name please?

USER: Sure, I am Emma Walker.

ASSISTANT: OK, please wait let me check the status of your reservation.

USER: Ok, take your own time.

ASSISTANT: Sorry to say there is no reservation found on your given name.

USER: Ok, not an issue.

ASSISTANT: Thank you for choosing us. Have a nice day.

USER: Thanks a lot for your time.