You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I have to change my reservation with new travelling dates. Can you please help me with that?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your name please?

USER: Sure, myself Larry Green.

ASSISTANT: Ok, please wait a minute.

USER: Sure, take your time.

ASSISTANT:  Thank you for waiting, sorry no reservation found on your 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, have a good day.

USER: Most welcome.