You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I oblige you today?

USER: Owing an emergence, I want to change my existing reservation. Can you please help me with it?

ASSISTANT: Sure, I will help you. May I know your name to check the status of your reservation?

USER: My name is Charles Phillips.

ASSISTANT: I regret that there is no reservation found on your name.

USER: Ok, no issues. Thanks for the help.

ASSISTANT: Ok, thanks for consulting us.