You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Cynthia Baker here.

ASSISTANT: Yes, Cynthia Baker.

USER: I would like to change my recent reservation because my trip dates are postponed, can you help me?

ASSISTANT: Sure, I can help you with that. Please wait for a while.

USER: Thank you.

ASSISTANT: Cynthia Baker, there is no reservation found under your name in our database to do changes in that.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for choosing us.