You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am Kenneth Wilson, I want to change my existing reservation due to some mismatching of dates with our friends, all are not ok with those dates, can you please help me?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Wait a moment, I will check with your details.

USER: Ok, take your time.

ASSISTANT: Wilson, there is no reservation found under your name.

USER: No issues, my friends might have cancelled my tickets also with theirs, thank you for your help.

ASSISTANT: Welcome. Thank you for choosing us.

USER: You are welcome.