You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you at this moment?

USER: Can you please help me in changing my recent reservation?

ASSISTANT: Sure, I will help you with that.

USER: Ok..

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

USER: Myself Charles Gonzalez.

ASSISTANT: Ok, please wait a moment.

USER: sure, I will wait.

ASSISTANT: Sorry Charles Gonzalez, no reservation has found under your name to change.

USER: Thank you for checking.

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