You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself James Mitchell.

ASSISTANT: How may I assist you today?

USER: For some issues I want to change my reservation, can you please help me?

ASSISTANT: Sure, I will help you, please wait for a minute.

USER: Sure.

ASSISTANT: Sorry, I could not find any reservation with your name.

USER: It's ok. Thank you for the information.

ASSISTANT: My pleasure.