You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you at this moment?

USER: Can you please do modification in my existing reservation which I have done wrongly?

ASSISTANT: Sure, I am happy to help you with that.

USER: Thank you.

ASSISTANT: Can I have your good name please to check availability of your reservation?

USER: My previous reservation has done with the name Brenda Campbell.

ASSISTANT: Ok, please wait a moment to check your reservation status.

USER: Sure, I will wait for your information.

ASSISTANT: Sorry Brenda Campbell, no reservation has found under your name to change.

USER: Ok, not an issue.

ASSISTANT: Thank you for choosing us, have a good day.

USER: Thank you for providing information.

ASSISTANT: Most welcome.