You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

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

ASSISTANT: Sure, please wait a moment.

USER: Sure, take your time.

ASSISTANT: Sorry, there is no reservation found on your name.

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

ASSISTANT: Thank you for approaching us.