You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you today?

USER: Can you please help me in changing my existing reservation?

ASSISTANT: Sure, please share me your good name.

USER: Dorothy Turner.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry to say that, there is no active reservation found on your  name.

USER: Ok, no issues.Thank you.

ASSISTANT: Thank you for opting us.