You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Timothy Wright.

ASSISTANT: How may I assist you?

USER: I would like to change my reservation which is under my name. Can you please help me with that?

ASSISTANT: Sure, I am here to help you out. May I know your travelling dates please? Timothy Wright, we haven't found any reservation under your name in our database.

USER: Ok, no issues. Thank you for checking.

ASSISTANT: Thank you for choosing us.

USER: You are welcome.