You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

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

ASSISTANT: Sure, may I know your name please?

USER: Ok, please check for the name Emma Miller.

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

USER: That is not a problem, thank you for assisting me.

ASSISTANT: Thanks for contacting us.