You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I want to change an existing reservation, so please help me in changing the reservation.

ASSISTANT: Sure, I will help you. Can you please share your name?

USER: My name is Rachel Thomas.

ASSISTANT: Please give me a minute.

USER: Ok.

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

USER: Not an issue. Thank you.

ASSISTANT: Thank you for approaching us.