You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I have planned to consult a doctor for monthly check up due to more emergency operations scheduled to him my appointment has been resheduled. Can you please change my reservation?

ASSISTANT: Sure, kindly mention your name?

USER: I am Jonathan Martin.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Sorry to say, no reservation found with your name.

USER: Thank you for your response.

ASSISTANT: Thanks for reaching us, have a good day.