You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Because of some business problems, can you please help me to change my existing reservation?

ASSISTANT: Yes sure. Give me a moment to check your details.

USER: Sure.

ASSISTANT: Can you help me out with your name?

USER: Myself Barbara Jones here.

ASSISTANT: No reservation found on your name. Sorry.

USER: That's fine.

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

USER: You are welcome.