You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I want to change my existing reservation, due to my meeting has been postponed. Can you aid me to change my reservation?

ASSISTANT: Sure, may I know your good name please?

USER: Sure, my name is Nicholas Robinson.

ASSISTANT: Please wait for few minutes. There is no recent reservation found on your name.

USER: Ok, thank you.

ASSISTANT: Thank you for reaching us.