You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you at this minute?

USER: Can you help me to change the reservation which I had done a week ago?

ASSISTANT: Sure, I am here to help you with that.

USER: Thank you for the positive response.

ASSISTANT: May I know your good name?

USER: My name is Jessica Hernandez.

ASSISTANT: Ok, wait for a minute.

USER: Ok, please take your own time.

ASSISTANT: Sorry to say that, there is no reservation found on your name in our database.

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

ASSISTANT: Thank you for reaching us.