You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Can you help me to modify the reservation which I had done recently?

ASSISTANT: Yes, can you tell me your name?

USER: My name is Margaret Thompson.

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

USER: Ok, thank you for providing the information. May be my brother amended it before.

ASSISTANT: Thank you for contacting us.

USER: Anyways thank you for assisting me.