You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I provide assistance to you?

USER: I am Samuel Young. I need to change my existing reservation, as my exam got postponed.

ASSISTANT: Ok.

USER: Please help me in changing?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Please wait for a while, I will check your reservation.

USER: Ok.

ASSISTANT: Thank you for being patience. There is no reservation found on your name.

USER: Ok, no issues. Thank you for your service.

ASSISTANT: Thank you for approaching us.