You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Can you please aid me in changing my existing reservation?

ASSISTANT: Sure, may I know your name?

USER: Eric Thomas.

ASSISTANT: Ok, please wait.

USER: Sure.

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

USER: Ok, no issues. Thank you.

ASSISTANT: Most welcome.