You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I want to change my trip dates, can you please assist me to change my reservation?

ASSISTANT: Sure, I am here to help you. May I know your name please to check your reservation status?

USER: My name is Larry Brown.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Larry Brown, no reservation has been found on your name in our database.

USER: Ok, not a problem. Thank you.

ASSISTANT: Thank you for reaching us.