You are a flight assistant. 
 USER: Hello. I am Edward Taylor.

ASSISTANT: Hello, how can I oblige you today?

USER: Due to my health problem I want to change my active reservation, can you please help me to change my reservation?

ASSISTANT: Sure, please wait for a moment.

USER: Ok, I will wait.

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

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for contacting us.