You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I render you today?

USER: My name is Betty Johnson.

ASSISTANT: Ok.

USER: I want to do some changes in my existing reservation. Can you help me for that?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Please wait for a minute.

USER: Sure, I will wait for your response.

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

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for opting us.