You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Andrew Green.

ASSISTANT: How may I help you?

USER: I need to change my reservation due to my planned event got postponed. So please help me with that.

ASSISTANT: Please wait a moment.

USER: Thank you for that. I will wait for your response.

ASSISTANT: Sorry, no reservation found by your name.

USER: Oh!  It may not be booked properly due to server issues. Anyway, thank you for your time.

ASSISTANT: Thanks.

USER: Most welcome.