You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself John Wilson.

ASSISTANT: How may I assist you today?

USER: I need to change my reservation due to some problems. So please help me with that.

ASSISTANT: Sure, I will help you, please wait for a minute.

USER: Thank you, please take your time.

ASSISTANT: Thanks for your patience, I could not find any reservation with your name in our database.

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

ASSISTANT: It's my pleasure, have a nice day.