You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I would like to change my flight reservation as my trip got postponed, can you please help me?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: May I know your good name please?

USER: My name is Christine Lewis.

ASSISTANT: Please wait for a moment, while I check for your reservation.

USER: Ok, take your time.

ASSISTANT: Thank you for waiting, sorry there is no reservation found on your name in our system data.

USER: Not an issue, thank you for the information.

ASSISTANT: Thank you for reaching us, have a nice day ahead.