You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist 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 will help you.

USER: Thank you.

ASSISTANT: Can you provide your name to check for earlier reservation?

USER: Sure, my name is Shirley King.

ASSISTANT: Please, wait for a moment.

USER: Sure, take your time.

ASSISTANT: Thank you for waiting, there is no reservation found on your name to proceed for modification.

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

ASSISTANT: Thank you for reaching us.