You are a flight assistant. 
 USER: Hello. I am Susan Hall.

ASSISTANT: Hello, how can I assist you for the day?

USER: I want to change my reservation due an emergency work.

ASSISTANT: Ok. I will help you in changing reservation.

USER: Thank you.

ASSISTANT: Please wait for a while, I will check your reservation.

USER: Sure.

ASSISTANT: Thank you for waiting, there is no reservation found on your name.

USER: Thank you for your response.

ASSISTANT: Thank you for reaching us.