You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Patrick Nelson.

ASSISTANT: How can I help you?

USER: Can you help me to modify my reservation I had did recently?

ASSISTANT: Sure, please wait a while.

USER: Ok, please take your own time. I will wait for your response.

ASSISTANT: Sorry to say, there is no reservation on your name in our database.

USER: That's ok, thank you for the information.

ASSISTANT: Thank you for contacting us.