You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: My name is Paul Thompson.

ASSISTANT: Nice to meet you.

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

ASSISTANT: Sure, I'm glad to help you in that. Please give me few seconds to check your reservation status.

USER: Thank you.

ASSISTANT: Paul Thompson, there is no reservation found under your name to do modifications in that.

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

ASSISTANT: Thank you for choosing us.