You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Paul Rodriguez here.

ASSISTANT: How may I help you today?

USER: Due to the inconvenience of travel dates, I want to change my existing reservation which is done recently. Can you please help me out?

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

USER: Thank you, I will wait for your response.

ASSISTANT: Paul, there is no reservation found under your name to do changes in that.

USER: That's fine, no problem. Thank you for searching.

ASSISTANT: Thank you for choosing us.