You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I help you today?

USER: I am Melissa Adams, need your help in changing my recent reservation. Can you help me?

ASSISTANT: Sure, We are here to help you.

USER: Ok.

ASSISTANT: Sorry, No reservation found on your name.

USER: It's ok. Thank you.

ASSISTANT: Thank you for choosing us, Have a good day.