You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

USER: I am Jonathan Lopez, can you help me to do some modifications in my reservation?

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

USER: Thank you.

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

USER: Take your time.

ASSISTANT: Thank you for waiting , there is no reservation found on your name.

USER: No issues. Thank you for checking.

ASSISTANT: Thank you for visiting us, have a nice day.

USER: You are welcome.