You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

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

ASSISTANT: Sure, can I know your name?

USER: Thank you. Myself Jack Smith.

ASSISTANT: Sorry, there is no reservation found on given name.

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

ASSISTANT: Thank you for reaching us.

USER: Most welcome.