You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: As I am not issued with my leave on the my scheduled dates, So I would like to change my reservation. Please help me with it.

ASSISTANT: Sure, may I know your good name?

USER: I am William Miller.

ASSISTANT: Please wait for a moment. I will check and get back to you.

USER: Ok.

ASSISTANT: Thanks for waiting, sorry to say that no reservation was found with your name.

USER: Fine, thank you.

ASSISTANT: Thanks for choosing us.