You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I would like to change my previous travelling dates, which is done recently. Can you please help me out in changing my reservation?

ASSISTANT: Yes, can you share me your name for checking?

USER: Sure, myself Linda Turner.

ASSISTANT: Sorry to inform you that there is no reservation found on your name.

USER: Not a big problem, anyway thank you for the information.

ASSISTANT: Thank you for contacting us.