You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I need you to make few changes in my recent booking. Please help me.

ASSISTANT: Sure, can you please let me know your name?

USER: My name is Melissa Brown.

ASSISTANT: Sorry, there is no active reservation found under your name to change.

USER: That's ok. Thank you.

ASSISTANT: Thank you for reaching us.