You are a flight assistant. 
 USER: Hi. I am Jessica Parker.

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

USER: I want to change my reservation, can you help me with that?

ASSISTANT: I am here to help you about that Jessica Parker.

USER: Thank you.

ASSISTANT: Please wait for sometime to check the reservation status with your name in our booking list.

USER: Sure.

ASSISTANT: I regret to say this Jessica Parker, there is no active reservation with your name in our booking list to change the reservation.

USER: Ok, thank you.

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