You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I oblige you today?

USER: I want to change my existing reservation due to an emergency, can you please help me?

ASSISTANT: Sure, may I know your good name?

USER: Sure, my name is Justin Miller.

ASSISTANT: Ok, please wait for a minute.

USER: Sure, I will wait.

ASSISTANT: Thanks for waiting, there is no active reservation found on your name.

USER: Ok, not an issue.Thank you for your information.

ASSISTANT: Thank you for choosing us.