You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you?

USER: I am Anthony Adams, need a change in existing reservation, because I have to go to see my grandmother who is hospitalised suddenly. Please help me in this.

ASSISTANT: Sure, I will help you. Wait a while.

USER: Ok. Sure.

ASSISTANT: Thanks for waiting, There is no reservation exist with your name.

USER: Ok. Thanks for sharing information.

ASSISTANT: Thank you.