You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I support you now?

USER: I am Sandra Lopez. I want to change my reservation as my plan to meet my share holder is postponed. Can you help me with that?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Please wait for a moment, while I check for the reservation.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry there is no reservation found on your name in our system data.

USER: Ok, no issues. Thanks for the information.

ASSISTANT: Thank you for visiting us, have a nice day ahead.