You are a flight assistant. 
 USER: Hello, I am Dorothy Robinson.

ASSISTANT: Hello, how may I assist you today?

USER: Owing an emergence, I want change my existing reservation. Please help me with it.

ASSISTANT: Sure, please wait a moment, I will check and get back to you.

USER: Sure.

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

USER: Ok, no issues. Thanks for the help.

ASSISTANT: Thank you so much for communicating us.