You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: Can you help me to change my recent reservation?

ASSISTANT: Sure, I am here to assist you. May I know your name?

USER: Dorothy Jones here.

ASSISTANT: Thank you. Please wait for a while. I will check your reservation status and let you know.

USER: Sure.

ASSISTANT: Sorry, I did not find any reservation under your name in our database.

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

ASSISTANT: You are welcome and thank you for choosing us.