You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

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

ASSISTANT: Sure, on which name can I find the reservation?

USER: On the name of Ruth Nelson.

ASSISTANT: No reservation found on your name.

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

ASSISTANT: Than you for choosing us.