You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I would like to change my existing reservation due to postpone of my seminar.

ASSISTANT: Sure, can I know your name to proceed?

USER: I am Rachel Williams.

ASSISTANT: Please wait for a moment to check your details.

USER: Sure, I will wait for your response.

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

USER: No worries, thank you for the information.

ASSISTANT: Thank you for reaching us.