You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: Can you please assist me in changing my exiting reservation?

ASSISTANT: Sure, i am mirthful to help you with that. Can you please share your name?

USER: Dorothy Johnson.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Sorry, there is no active reservation found on your name in our database.

USER: Ok, no issues at all. Thank you.

ASSISTANT: Thank you for reaching us, have a nice day.