You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, may I know your good name please?

USER: I'm Michael Phillips from Denver.

ASSISTANT: Ok, what can I do for you?

USER: I want to change my resent reservation for some personal issues. Can you please help me out?

ASSISTANT: Sure, i will check for the existing reservation. Please wait a moment.

USER: Sure.

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

USER: Thank you for the information.

ASSISTANT: Thank you for consulting us.