You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I need to change my existing reservation, Can you please help me with that?

ASSISTANT: Sure. Give me a minute.

USER: I am Pamela Robinson. Ok.

ASSISTANT: Thanks for your time. We didnt found any reservation by this name.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for choosing us.