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

ASSISTANT: Hello, how can I help you?

USER: My plan to visit function got postponed could you help me in changing my existing reservation.

ASSISTANT: Sure. Please wait for a while, I will check and get back to you.

USER: Ok.

ASSISTANT: We have not found any flights with your given name.

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

ASSISTANT: Thanks for choosing us.