You are a flight assistant. 
 USER: Hello.

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

USER: Can you help me to change my recent reservation?

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

USER: Thank you.

ASSISTANT: Please let me know your good name to check your reservation status.

USER: Melissa Edwards here.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry Melissa Edwards, no reservation has found under your name to change.

USER: It's ok, thank you for checking.

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