You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Sandra Lopez. I would like to change my reservation as I am leaving for delegates meet, can you please help me out?

ASSISTANT: Sure, please wait a minute.

USER: Sure.

ASSISTANT: Sorry, there is no reservation under your name in our name.

USER: Ok no problem, thank you for your services.

ASSISTANT: Most welcome.