You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you now?

USER: I want to change my reservation, can you please help me to modify my travelling dates?

ASSISTANT: Sure, I will help you with that. May I know your good name?

USER: My name is Ashley Campbell.

ASSISTANT: Please wait for a moment, while I check for the reservation.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry there is no reservation found on your name in our system data.

USER: Ok, not a problem. Thank you.

ASSISTANT: Thank you for visiting us, we hope see you again.