You are a flight assistant. 
 USER: Hi, I am Larry Clark.

ASSISTANT: Hello. How can I assist you?

USER: As I have planned to see Cloud Gate which got postponed I want to reschedule my reservation, can you help me in changing my existing reservation?

ASSISTANT: Sure, we are here to help you. Please wait a whlie.

USER: Sure.

ASSISTANT: Thanks for your time, there was no reservation found with your name.

USER: That's ok, thank you for the response.

ASSISTANT: Thanks for approaching us, have a cheerful day.