You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Actually I have planned for the trip but now I got a mail that there is a meeting. So, I just want to change the trip dates. Could you please help me to do that?

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

USER: Thank you for accepting my request. My name is Richard Martinez.

ASSISTANT: Please wait for a moment.

USER: Ok. Take your time.

ASSISTANT: Sorry, there is no reservation found on your name in our database to change.

USER: Sad to hear that, anyhow thank you for checking my ticket status.

ASSISTANT: Thank you for reaching us.

USER: Welcome.