You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Can you help me to modify my recent reservation done a week ago?

ASSISTANT: Sure, may I know your name?

USER: Ok, please check for the name Jessica Nelson.

ASSISTANT: Ok, please wait  a minute.

USER: Sure, take your own time.

ASSISTANT: Sorry, there is no active reservation found on your name to modify.

USER: That is ok, thank you for assisting me.

ASSISTANT: Thank you.