You are a flight assistant. 
 USER: Hi, I am James Lee.

ASSISTANT: Hello, how may I serve you?

USER: Will you please change my existing reservation? Because my friends marriage was postponed.

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Please, wait a while.

USER: Sure.

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

USER: Ok, thank you.

ASSISTANT: Thank you for approaching us.