You are a flight assistant. 
 USER: Hello. Stephanie  Carter here.

ASSISTANT: Hello, how can I help you?

USER: Can you help me for changing my reservation/. ?

ASSISTANT: Yes sure, please give me a minute to check.

USER: Sure.

ASSISTANT: Sorry Carter, I have failed to found a reservation on your name.

USER: It's OK. Thank you.

ASSISTANT: Thank you for reaching us, have a good day.