You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I support you now?

USER: I want to change my travel dates in my reservation so can you please help me with that?

ASSISTANT: Sure, I will help you to change your reservation.

USER: Thank you for your response.

ASSISTANT: May I know your good name?

USER: Sure, my name is Melissa Lee.

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

USER: Ok.

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

USER: Oh! It's ok, no problem. Thank you for your information.

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