You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Ryan Taylor and I want to change my reservation.

ASSISTANT: How can I help you?

USER: Can you help me out in this?

ASSISTANT: Ok. Please wait for a while.

USER: Sure.

ASSISTANT: Thanks for being patient. Unfortunately, there is no reservation found on your given name.

USER: Ok, thank you.

ASSISTANT: Thank you for reaching us.