You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you today?

USER: Can you help me in changing my recent reservation?

ASSISTANT: Sure, I will aid you with that.

USER: Thank you.

ASSISTANT: May I know your name for further process?

USER: I am Jonathan Walker.

ASSISTANT: Ok, please hold on a moment.

USER: Sure.

ASSISTANT: There is no previous reservation available under your name.

USER: Its ok, thank you.

ASSISTANT: Thank you for contacting us.