You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I am Christopher Young. I want to change my existing reservation due to postpone of my exams, so can you help me with this?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Please, wait a minute.

USER: Sure.

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

USER: No problem, thank you for the information.

ASSISTANT: Thank you for approaching us.