You are a flight assistant. 
 USER: Hi, I am Michelle Davis.

ASSISTANT: Hello, how can I help you?

USER: I need to change my existing reservation as my venue of jewellery expo has been changed. Will you help me in changing my reservation?

ASSISTANT: Sure, I am willing to help you.

USER: Thank you.

ASSISTANT: Please give me a minute.

USER: Sure.

ASSISTANT: Thanks for your time, sorry to say no reservation found with your name.

USER: Ok, no issue.

ASSISTANT: Thank you for availing us, have a nice day.

USER: Thank you.