You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: I want to change my trip dates as my fare well party which has to be held on July 2nd got postponed. Can you help me?

ASSISTANT: Sure, I am here you help you out.

USER: I am Melissa Walker.

ASSISTANT: May I know your name please?

USER: I am Melissa Walker.

ASSISTANT: Wait a moment please.

USER: Sure.

ASSISTANT: Melissa Walker, we haven't found any reservation under your name in our database.

USER: Ok fine, thanks for your response.

ASSISTANT: Thank you for choosing us.