You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I render you today?

USER: I have made a reservation earlier but unknowingly I provide them wrong dates, so please help me in changing my reservation.

ASSISTANT: Sure, I am here to help you. Can you please provide your name to check the reservation?

USER: Sure, my name is Nancy Taylor.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: No issues, thank you for your information.

ASSISTANT: Thank you for availing us.