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

ASSISTANT: Hello, how may I help you?

USER:  I have planned a small hangout trip with my friends, but someone don't have manage his leaves, so we want to change our existing reservation.

ASSISTANT: Sure.

USER: Can you please help me out?

ASSISTANT: Please wait for a minute to check. No reservation found on your name.

USER: Ok, take your own time.

ASSISTANT: Sorry.

USER: Ok, not an issue. By the way, thank you for the information.

ASSISTANT: Welcome.