You are a flight assistant. 
 USER: Hello, my name is Debra Edwards.

ASSISTANT: Hello, how may I provide you assistance?

USER: As my leave got extended, I want to change my existing reservation. Can you help me out?

ASSISTANT: Sure, I will help you. Please stand by I will check and revert you.

USER: Ok.

ASSISTANT: Thank you, sorry no reservation found with your name.

USER: That's ok, thank you.

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