You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I oblige you?

USER: Owing to an emergency I had to request for this change reservation.

ASSISTANT: Ok.

USER: Can you please help me to change an existing reservation?

ASSISTANT: Sure, may I know your name to check reservation?

USER: My name is Stephen Wilson.

ASSISTANT: Please, wait for a while.

USER: Sure, I will wait.

ASSISTANT: Thanks for being patience, there is no reservation found on your name.

USER: Ok, not a problem. Thank you.

ASSISTANT: Thank you for opting us.