You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you now?

USER: I would like to change my recent reservation due to some personal issues, will you help me?

ASSISTANT: Sure, I am happy to help you with that. Can I have your name please to check your reservation?

USER: Myself Donna Thomas.

ASSISTANT: Ok, please wait a moment.

USER: Sure, take your own time.

ASSISTANT: Sorry Donna Thomas, no reservation has found under your name to change.

USER: Ok, not an issue. Thank you for your information.

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