You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I'm Alexander Anderson.

ASSISTANT: Alexander, how can I assist you?

USER: I would like to change my reservation as my trip got postponed. Can you please help me with that?

ASSISTANT: Sure, I will help you. Please wait, let me check your reservation status in our database.

USER: Sure, take your time.

ASSISTANT: Alexander, I did not find any reservation under your name in our database.

USER: Ok, no issues. Thank you for checking.

ASSISTANT: You are welcome and thank you for choosing us.

USER: You are welcome.