You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you for today?

USER: I am trying to change my trip details because I planned for some other trip. Can you please help me to change?

ASSISTANT: Yes, I can help you.

USER: Thank you.

ASSISTANT: Could you tell me your name for checking your previous reservation?

USER: My name is Margaret Turner.

ASSISTANT: Give me a moment.

USER: Ok, take your time.

ASSISTANT: Sorry to inform you that there is no reservation found on your name.

USER: It's ok, thank you.

ASSISTANT: Thank you for reaching our agency.

USER: Welcome.