You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you today?

USER: Can you please help me with changing my travelling dates with my previous booking?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: May I know your good name please?

USER: My name is Richard Thompson.

ASSISTANT: Please wait a minute.

USER: Ok, I will wait for your reply.

ASSISTANT: Sorry, there is no active reservation on your name to change.

USER: Oh! That's very sad to know. Thank you for checking anyways.

ASSISTANT: Thank you for opting us.

USER: Most welcome.