You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you today?

USER: Please help me to change my recent reservation.

ASSISTANT: Sure, may I know your good name?

USER: Melissa Collins.

ASSISTANT: Ok, please wait for sometime.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no reservation found on your name.

USER: Thank you for your information.

ASSISTANT: Thank you for reaching us.