You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I guide you for today?

USER: Can you please help me in changing my recent reservation?

ASSISTANT: I am happy to help you in changing your reservation.

USER: Ok. Thank you.

ASSISTANT: Can you please provide your name for checking the booking list about the reservation status?

USER: Myself Rebecca Jackson.

ASSISTANT: Sorry to say this Rebecca Jackson, there is no active reservation with your name to change the reservation.

USER: Ok, fine thank you for checking.

ASSISTANT: You are welcome, thank you for reaching us.