You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I have planned to go for meeting but my meeting got postponed. Can you please help me in changing my existing reservation?

ASSISTANT: Sure, may I know your name?

USER: I have reserved my flight ticket with name Emily Smith.

ASSISTANT: There is no reservation found under your name.

USER: Ok, fine thank you for your help.

ASSISTANT: Most welcome.