You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how  can I help you for the day?

USER: I want to make changes in my existing reservation as my trip is postponed to next month, can you help me?

ASSISTANT: Sure, I am here to help you with that changing reservation. May I know your name please?

USER: The name on the ticket is Michelle Johnson.

ASSISTANT: Please wait for a moment, let me check your previous reservation status.

USER: Sure, I will wait for your response.

ASSISTANT: Thank you for waiting.

USER: My pleasure.

ASSISTANT: There is no reservation found on your name in our reservation list to change it.

USER: Not an issue, anyway thank you for checking.

ASSISTANT: Thank you for reaching us. Have a great day.