You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can 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: Ok, may I know your name please to check the reservation status?

USER: My name is Gary Perez.

ASSISTANT: Gary, please give me a minute.

USER: Sure, take your time.

ASSISTANT: There is no reservation found with your details in our servers.

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

ASSISTANT: Thank you for contacting us, have a nice day.