You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Donna Rodriguez.

ASSISTANT: How may I assist you at this moment?

USER: I am trying to modify my traveling dates in the past ticket but it is not get updating. Can you please help me?

ASSISTANT: Sure, I am happy to help you with that.

USER: Thank you for accepting my request.

ASSISTANT: Please wait a moment to check your previous reservation.

USER: Ok, take your time.

ASSISTANT: Sorry to inform you that, there is no reservation with your name in our database.

USER: It's ok, not an issue. Anyways thank you for seraching.

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