You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I provide service to you?

USER: I am Shirley Robinson. Due to sudden work, I need to change my reservation. Can you please help me with it?

ASSISTANT: Sure, I am here to help you. Please wait, I will check the reservation on your name and revert to you.

USER: Ok.

ASSISTANT: Sorry, we didn't find any reservation on your name.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for reaching us.