You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how best can I assist you today?

USER:  Will you please assist me to change my existing reservation as my plan to meet my friend got postponed?

ASSISTANT: Sure, please share your good name?

USER: Donna Taylor here.

ASSISTANT: Please stand by.

USER: Ok.

ASSISTANT: Please stand by.

USER: Ok.

ASSISTANT: Thank yo for waiting, there is no active reservation found with the given name.

USER: No issue, Thank you for the information.

ASSISTANT: Thank you.