You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I want to change my existing reservation, as most my friend a travelling to some other place. Can you please help me?

ASSISTANT: Can you please tell your name to check your reservation details?

USER: Yes, I am Samantha Moore.

ASSISTANT: Sorry, there is no reservation found by your name.

USER: That's ok. Thank you for your information.

ASSISTANT: Thank you and have a nice day.