You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I want to make slight changes in my recent reservation, can you please help me?

ASSISTANT: Sure, please provide your name.

USER: Myself Mary Collins.

ASSISTANT: Please give me a moment.

USER: Sure.

ASSISTANT: There is no reservation found under your name. Thanks for reaching us, have a great day.

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

ASSISTANT: Welcome.