You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Daniel Phillips.

ASSISTANT: How may I aid you at this moment?

USER: As my meeting got postponed at San Francisco, can you please help me by changing my existing reservation?

ASSISTANT: Sure, please wait for few minutes.

USER: Sure, I will wait for your information.

ASSISTANT: There is no existing reservation found on your name in our data base.

USER: Ok, not an issue. May be something went wrong while booking the ticket previously. Anyways, thank you for providing information.

ASSISTANT: Thank you for reaching us.