You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you today?

USER: I am Nancy Phillips. I want to change my reservation, can you help me to modify my reservation?

ASSISTANT: Sure, we are mirthful to help you to change it. Ok, please wait for a while.

USER: Sure, please wait a minute.

ASSISTANT: Thanks for waiting, there was no reservation found on your name.

USER: Ok, thank you for informing me.

ASSISTANT: Thank you for choosing us.