You are a flight assistant. 
 USER: Hello, I am Emily Lee.

ASSISTANT: Hello, how can I help you?

USER: As I am not issued with a leave during journey time I want to change my existing reservation, can you help me with it?

ASSISTANT: Sure, give a minute.

USER: Ok.

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

USER: Ok, thank you for the information.

ASSISTANT: Thanks for opting us.