You are a flight assistant. 
 USER: Hello. I am Gary Hill.

ASSISTANT: Hello, how can I render you today?

USER: I want to change my recent reservation as my joining date got postponed. Can you help me in changing?

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: We are sorry to inform Gary Hill, there is no reservation found on your given name.

USER: No worries, thank you for your help.

ASSISTANT: Thank you for reaching us.