You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello. How can I assist you?

USER: I am Emily Anderson.

ASSISTANT: Ok.

USER: I want to change my journey date as my plan to visit San Francisco is postponed, can you help me with changing the reservation?

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Sorry, Emily no reservation found on your name to change.

USER: Ok, no problem. Thanks for the information.

ASSISTANT: Thank you for opting our service.