You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you today?

USER: As part of my schedule I made a reservation earlier to meet my client, unfortunately he is unavailable on that day. So I want to change my existing reservation to other day. Can you help me out for this?

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

USER: I am Patrick Nelson.

ASSISTANT: Please wait. I will check the status and let you know.

USER: OK.

ASSISTANT: Thanks for your valuable time. There was no reservation found on your name.

USER: Ok, not a problem. Thanks for your response.

ASSISTANT: Thank you for contacting us. Have a good day.