You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you at this moment?

USER: I am Michael Smith. I need to change my recent reservation due to postpone of my exam. Could you please help me in doing that?

ASSISTANT: Sure, please wait for few minutes.

USER: Sure.

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

USER: No worries, thank you for your valuable information sharing with me.

ASSISTANT: Thank you for approching us.