You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you at this moment?

USER: Samantha Allen here. I would like to change my reservation, can you help me out with that?

ASSISTANT: Sure, we are here to help you with that.

USER: Thank you.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry to inform you that, we did not find any reservation with your name.

USER: No issues, thank you for your time.

ASSISTANT: Thank you for reaching us.