You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: Myself Jerry Roberts.

ASSISTANT: Nice to meet you Jerry.

USER: I need to change my existing reservation, can u please help me out?

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

USER: Take your time.

ASSISTANT: I could not find any reservation with your name in our database.

USER: That's is not an issue. Thank you for helping me.

ASSISTANT: Thanks for choosing us.