You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Can you please help me in changing my reservation as I cannot travel right now?

ASSISTANT: Yes, can you tell me your name?

USER: My name is Charles Hall.

ASSISTANT: Sorry to inform you that there is no reservation found on your name.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for contacting us.