You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I guide you today?

USER: Thomas Adams here. I would like to spend some more days with my family, so please help me in changing my existing reservation.

ASSISTANT: Sure, I would be happy to help you with that. Please wait for a while.

USER: Ok.

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

USER: That's fine, thank you for your help.

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