You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: I am Alexander Moore.

ASSISTANT: Nice to meet you Moore.

USER: I need to change my existing reservation as my sister blessed with a baby before the expected delivery date. Can you help me?

ASSISTANT: Sure, I am here to help you out. Hold on for a moment please. Sorry to say this Moore, there are no reservations found under your name.

USER: Thank you. No issue.

ASSISTANT: Thank you for reaching us. Have a good day.