You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I want to change my reservation, can you help me?

ASSISTANT: Sure, I will help you with that. Can I have the name on which you reserved earlier?

USER: Myself Pamela Miller.

ASSISTANT: Ok, please wait a moment and I will check the reservation status.

USER: Sure.

ASSISTANT: Sorry Miller, no reservation found under your name to change.

USER: No problem, thanks for checking.

ASSISTANT: My pleasure. Thank you for choosing us, have a great day.