You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Eric Clark is my name.

ASSISTANT: How can I assist you at this moment?

USER: I just want to change my existing reservation, due to sudden demise of my grand mother.

ASSISTANT: Sure, I will help you with this. Please give me a moment to check your reservation status.

USER: Ok.

ASSISTANT: Eric Clark, there is no active reservation found under your name in our database.

USER: That's ok, no problem. Thank you for checking.

ASSISTANT: Thank you for utilising our service.