You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

USER: I am Justin Collins. Due to health issue I need to change my reservation, can you please help me?

ASSISTANT: Sure. Please, wait.

USER: Ok.

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

USER: No problem, thank you.

ASSISTANT: Thank you.