You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Due to postpone of my exams I want to change my existing reservation, will you help me?

ASSISTANT: Sure, I will help you.

USER: Thanks.

ASSISTANT: Please help me with your good name?

USER: Myself George Brown.

ASSISTANT: Ok, please wait for some time.

USER: Sure.

ASSISTANT: There is no existing reservation found on your name.

USER: Ok no problem. Thank you.

ASSISTANT: Thank you for approaching us.