You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Ryan Walker.

ASSISTANT: How can I assist you?

USER: Owing for an emergency, I want to change my reservation. Can you please do that for me?

ASSISTANT: Sure Ryan, please wait a moment.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: No problem, thank you for checking.

ASSISTANT: Thank you for approaching us.