You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Paul Harris.

ASSISTANT: How can I help you Harris?

USER: Due to some seminars I am going to change my existing reservation. Could you please help me in changing the reservation?

ASSISTANT: Ok, please wait for a while.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry Paul, no reservation found by your name in our database.

USER: Not an issue, anyhow thank you very much for your help.

ASSISTANT: You are welcome.