You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you for the day?

USER: Can you please help me to change the travel dates in the existing reservation?

ASSISTANT: Sure, I am here to help you with this. May I know your name please?

USER: Thank you for considering my request. My name is Rebecca Moore.

ASSISTANT: Please hold for a while, let me check your previous reservation status. Thank you for waiting.

USER: Ok.

ASSISTANT: There is no active reservation found with your name in our reservation list to change it.

USER: Not a problem with that, thank you for your valuable time.

ASSISTANT: Thank you for approaching us, have a great day.

USER: You are most welcome.