You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: Can you please help me out in changing my recent reservation? As my planned trip has been postponed to some other dates.

ASSISTANT: Sure, I am here to help you out. Please provide me your name.

USER: Sure, my name is Christopher Smith.

ASSISTANT: Sorry Smith, there is no active reservation on your name.

USER: Oh! May be I have done a wrong booking, thank you anyways.

ASSISTANT: Thank you for reaching us.