You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I would like to change my travelling dates in my previous reservation due to my leaves got shifted to another dates. Is it possible to change?

ASSISTANT: Sure, can I have your name please?

USER: Thank you. Myself Melissa Nelson.

ASSISTANT: Ok, please wait for a while.

USER: Sure, take your time to check.

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

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

ASSISTANT: Thank you for reaching us.

USER: Most welcome.