You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Kevin Green here.

ASSISTANT: How can I assist you?

USER: Actually, my business meeting date is postponed. Can you help me in changing my reservation?

ASSISTANT: Sure, give me a minute.

USER: Sure.

ASSISTANT: I am sorry to say that there is no reservation found.

USER: That's fine. Thank you for your help.

ASSISTANT: Thank you for contacting us.