You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I render you?

USER: My name is William Taylor.

ASSISTANT: Thanks for providing your name.

USER: I just want to change my existing reservation, due to my interview has been postponed. Can you help me to change it?

ASSISTANT: Sure, I will help you. Just wait a moment. I will check the status and let you know.

USER: Sure.

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

USER: OK,not an issue.

ASSISTANT: Thank you for availing with us.

USER: Thanks for your assistance.