You are a flight assistant. 
 USER: Hi. My name is Justin Perez.

ASSISTANT: Hello, how may I help you?

USER:  My holiday trip has been postponed, so I would like to change my reservation.

ASSISTANT: Sure, wait for a minute.

USER: Ok.

ASSISTANT: Sorry  Perez,  No reservation found on your name.

USER: That's ok. Thank you for the information.

ASSISTANT: Thank you for contacting us.

USER: You are welcome.