You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I made a reservation to go on a trip, but it looks like I cannot make it so can you please change my dates of reservation?

ASSISTANT: Sure, may I know your name?

USER: My name is Jack Lewis.

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

USER: No worries, thank you.

ASSISTANT: Thank you for choosing us.