You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Melissa Martinez.

ASSISTANT: How may I assist you today?

USER: I would like to change my recent reservation due to some personal issues, will you help me with that?

ASSISTANT: Sure, we are here to help you.

USER: Thank you for accepting my request.

ASSISTANT: Please wait a minute.

USER: Ok, I will wait for your response.

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

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for availing us.