You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I support you today?

USER: I would like to change my existing reservation as my manager does not approve my leaves. Please help me out.

ASSISTANT: Sure, I am here to help you with this.

USER: Thank you.

ASSISTANT: May I know your name to trace your reservation details?

USER: My name is Betty Lopez.

ASSISTANT: Ok, please wait a moment I'll check the reservation list.

USER: Sure, take your time.

ASSISTANT: Thank you for waiting, Sorry, there is no active reservation have been found under your name in our database to amend it.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thank you for approaching us.