You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I address you today?

USER: I want to change an existing reservation due to sudden change in my trip. Can you help me?

ASSISTANT: Sure, for that I need to know your name. Can you provide it?

USER: I am Janet Davis.

ASSISTANT: Ok, please wait a moment I will check and let you know.

USER: Ok.

ASSISTANT: Thanks for waiting, we did not found any reservation by this name.

USER: That's fine.

ASSISTANT: Thank you for opting us.

USER: Thank you.