You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello.

USER: I am Cynthia martin.

ASSISTANT: How can I serve you today?

USER: I want to change my existing reservation as I am no issued with leave. Please help me.

ASSISTANT: Sure. Please, wait for a while.

USER: Ok, take your time.

ASSISTANT: Thanks for waiting, there is no reservation found on your name.

USER: No issues, thank you.

ASSISTANT: Thank you for approaching us.