You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I serve you today?

USER: I want to change my recent reservation. Can you help me out?

ASSISTANT: Sure, I'll help you in changing an existing reservation. Can I know your name to check the reservation status?

USER: I am Debra King.

ASSISTANT: Ok, please wait a moment.

USER: Ok, tale your time.

ASSISTANT: Sorry, there is no active reservation have been found under your name in our database to change it.

USER: That's ok. Anyways, thank you.

ASSISTANT: Thank you for availing us.