You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Christopher Garcia. I have a reservation to attend an interview. It has been completed in Skype. Can you please change my existing reservation?

ASSISTANT: Sure, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, no reservation done on your name.

USER: No worries. Thanks for your response.

ASSISTANT: Thank you for approaching us.