You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I amend you?

USER: I am Eric Roberts. Due to some weather problems I need to change my existing reservation, Can you please help me with that?

ASSISTANT: Sure, let me go through the reservation list and revert you.

USER: Ok.

ASSISTANT: It's unfortunate that we could not find a by reservation by the name you mentioned.

USER: Ok, no issues. Thanks for approaching us.

ASSISTANT: Thank you for consulting us.