You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Laura Jackson.

ASSISTANT: Laura Jackson, how may I assist you today?

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

ASSISTANT: Definitely I will help you. Please allow me a minute to get your details.

USER: Sure, I will wait for your response.

ASSISTANT: I am sorry to inform you that there is no reservation done on your name.

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

ASSISTANT: Thank you for reaching us. Have a wonderful day.

USER: Welcome.