You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I render you for the day?

USER: I am having some important work on the date I have booked the ticket previously, but it has postponed. So can you help me to change my ticket?

ASSISTANT: Sure, please provide your name to change the reservation?

USER: Barbara Collins is my name.

ASSISTANT: Ok, please hold on.

USER: Sure.

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

USER: Ok, no issues. Thanks for your information.

ASSISTANT: Thank you for approaching us.