You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How exactly I can serve you the best today?

USER: I intend to change my existing reservation due to some health issues which was made on the name of Debra Turner. Can you help me with it?

ASSISTANT: Sure, we are here to help you. Please wait for a minute.

USER: Sure.

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

USER: It's ok, thank you.

ASSISTANT: Thank you for opting us.