You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I would like to shift my planned dates to some other dates, please help me in changing my existing reservation.

ASSISTANT: Sure, I can help you with that. May I know your good name please?

USER: My name is Richard Phillips.

ASSISTANT: Ok, please wait while I'll check your reservation status.

USER: Sure, take your time.

ASSISTANT: Richard Phillips, there is no active reservation found under your name to do modifications in that.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thank you for choosing us.