You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

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

ASSISTANT: Sure, please wait a moment I will check your details and proceed further.

USER: Sure, I will wait for your response,.

ASSISTANT: Ok. Sorry to say, there is no reservation on your name in my database.

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

ASSISTANT: Thank you for reaching us, have a nice day.

USER: Welcome.