You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I want to change my recent reservation, Can you please help me in that?

ASSISTANT: Sure, I am here to help you with that.

USER: Thank you.

ASSISTANT: Can you please share me your name?

USER: My name is Melissa Hall.

ASSISTANT: Sorry, no reservation found on your name to change your reservation.

USER: Ok, that's not a problem. Thanks for your information.

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