You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I be at your assistance?

USER: Please help me to change an existing reservation as my plan to meet my old friend got postpone.

ASSISTANT: Sure, we are rapturous to help you.

USER: Thank you.

ASSISTANT: May I know your name?

USER: I am Alexander Turner.

ASSISTANT: Give me a minute.

USER: Sure.

ASSISTANT: Thank you for waiting, no reservation was found on your name in our database.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for approaching us.