You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Sarah Adams here. 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. Please, standby.

USER: Sure.

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

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

ASSISTANT: Thank you for availing us.