You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

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

ASSISTANT: Sure, please let me know your name.

USER: Steven Phillips.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no reservation found under your name in our data base.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for opting us.