You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: Myself Anna Thompson, I am willing to change my existing reservation. Can you please help me for this?

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

USER: Sure, I will wait for your response.

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

USER: Not a big deal, anyway thank you very much for your kind service.

ASSISTANT: My pleasure.