You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Owing to an emergency, I just want to change my existing reservation. Can you please aid me to change it?

ASSISTANT: Sure, I'm glad to help you in that. May I know your good name please?

USER: Sure, Pamela Collins is my name.

ASSISTANT: Ok, please let me check your reservation status first.

USER: Sure.

ASSISTANT: Pamela Collins, there is no active reservation found under your name to do changes in that.

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

ASSISTANT: Thank you for choosing us.