You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: Assist me changing my previous flight reservation as I modified my journey dates.

ASSISTANT: Ok, let me know your good name please?

USER: Eric Roberts here.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: Ok, not an issue. Thanks for your response.

ASSISTANT: Thank you for choosing us.