You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Melissa Green.

ASSISTANT: How can I guide you today?

USER: I need to change my reservation due to my planned event got postponed. So please help me with that.

ASSISTANT: Ok,  I will help you with that. Please wait for a while.

USER: Thank you. I will wait for your response.

ASSISTANT: Sorry, I did not found any active reservation on your name to change.

USER: Oh! It may not be booked properly due to server issues while booking. Anyway, thank you for your time.

ASSISTANT: Thank you for availing us.