You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: Helen Roberts here. I want your help in changing my reservation. Can you please help me in that?

ASSISTANT: Sure, give me a minute.

USER: Ok, take your time.

ASSISTANT: Sorry, there is no active reservation found under your name.

USER: It's ok, no problem. Anyway thank you for the information.

ASSISTANT: Thank you for choosing us.