You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I assist you?

USER: I am Emma Allen. I already have a reservation as my plan to visit my sister house is postponed to new dates.

ASSISTANT: Ok.

USER: Can you help me to change my reservation?

ASSISTANT: Sure, please standby.

USER: Sure.

ASSISTANT: Thanks for being patience. We hardly tried to find your reservation but, couldn't find any reservation in your name.

USER: Ok, thank you for the information.

ASSISTANT: Thanks for reaching us. Hope to serve you again.