You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Eric Lewis here.

ASSISTANT: What kind of help are you expecting from my side?

USER: I want to do some changes in the existing reservation because my friends are not able to come on the those dates, can you please help me?

ASSISTANT: Sure.Hold on for a moment, let me check.

USER: Ok.

ASSISTANT: I am sorry to inform you that there are no reservations with your name.

USER: No issues, thanks for your information.

ASSISTANT: Thank you, have a great day ahead.