You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I have some changes in my existing reservation so, can you please out with that?

ASSISTANT: Ok, may I know your name.

USER: I have reserved my flight ticket with Jessica Scott.

ASSISTANT: No reservation is found by your name Jessica Scott.

USER: Ok, fine not an issue. Thank you for your help.

ASSISTANT: Thank you for reaching us.