You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Alexander Nelson.

ASSISTANT: How can I help you?

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

ASSISTANT: Just a moment please.

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

ASSISTANT: I am sorry no reservation found on your name.

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

ASSISTANT: Thank  you.