You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. Good morning. How may I help you?

USER: Due to sudden change in my plan, I would like to change my existing reservation.Can you please help me?

ASSISTANT: Sure, I will help you. On which name you want me to check the status of the reservation?

USER: Check with Nancy Davis.

ASSISTANT: Please wait a minute, Nancy.

USER: Ok.

ASSISTANT: Nancy, there are no active reservations found with your details. Would you like to know any other information?

USER: Ok, fine. No.

ASSISTANT: Thank you for contacting us, Nancy. Have a good day.

USER: Thank you for checking.

ASSISTANT: Your most welcome.