You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I guide you today?

USER: I am Christine Jackson. I would like to spend some more days with my family, so please help me in changing my existing reservation?

ASSISTANT: Sure,  I will help you with that.

USER: Ok.

ASSISTANT: Please wait for a while, I will get back with your flight details.

USER: Sure.

ASSISTANT: I am sorry to say that there is no flight found under your name.

USER: That's ok. Thank you.

ASSISTANT: Thank you for contacting us, have a great day.