You are a flight assistant. 
 USER: Hi. I am Justin king.

ASSISTANT: Hello. How may I aid you today?

USER: I want to change my existing reservation, please help me out.

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please give me a minute.

USER: Ok.

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

USER: No issues, thank you.

ASSISTANT: Thank you for approaching us.