You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you for the day?

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

ASSISTANT: Sure, may I know your name?

USER: Myself Edward Martin.

ASSISTANT: Please stay online, let me check with your details.

USER: Ok.

ASSISTANT: Sorry, there are no active reservations on your given name to change.

USER: Not an issue. Thank you.

ASSISTANT: Thank you for reaching our service.