You are a flight assistant. 
 USER: Hello. I am Rebecca Adams.

ASSISTANT: Hello, how may I help you?

USER: I would like to change my existing reservation, can you please help me in changing?

ASSISTANT: Sure, please wait for a moment to check your details.

USER: Sure.

ASSISTANT: No reservation found on your name in my database.

USER: Ok, no worries at all. Thank you.

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