You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. Could you please tell me how may I guide you?

USER: I need to change my reservation as my planned event got shifted to another location due to weather conditions. So please help me with changing my reservation.

ASSISTANT: Sure, I am here to provide you the service regarding the changing the ticket details. Can I have your personal information like name?

USER: Thank you for accepting my request. Please check the reservation with my name Nancy Perez.

ASSISTANT: Ok, please hold on for a minute.

USER: Sure, I will wait for your response.

ASSISTANT: Thank you for waiting. Sorry, as per your concern I can not change your reservation because I did not found your past ticket in our database.

USER: I will check my mail once again for confirmation of my ticket booking whether it has booked or not. Anyway, thank you for your time.

ASSISTANT: You are most welcome. Thank you for reaching us.

USER: Most welcome.