You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Paul White.

ASSISTANT: How may I assist you today?

USER: I just want to change my existing reservation due to some personal issues, can you please help me in changing the reservation please?

ASSISTANT: Sure, I am here to help you, please wait for a minute.

USER: Ok, take your time.

ASSISTANT: I could not find any reservation with your name in our database.

USER: Ok, not a issue. Thank you for the information.

ASSISTANT: Thanks for reaching out to us.