You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you for today?

USER: Owing to an emergency, I want to change my reservation. Can you help me with that?

ASSISTANT: I am happy to help you about that. Can you please let me know your name for checking the reservation status?

USER: Thank you. Sure, Sarah Lopez here.

ASSISTANT: Please be on hold to check accordingly in our booking list.

USER: Sure.

ASSISTANT: Sorry Sarah Lopez, there is no active reservation under your name to change the reservation.

USER: Ok, no issues. Thank you.

ASSISTANT: You are welcome, thank you for reaching us.