You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: My meeting got postponed as of now, so I need to change my existing reservation. Can you help me in that?

ASSISTANT: Sure, may I know your name to check for the previous reservation?

USER: Sure, the ticket has been reserved on the name Brian Baker.

ASSISTANT: Please allow me a moment to check for the reservation status.

USER: Sure, I will wait for your response.

ASSISTANT: Brian Baker, there is no reservation found under your name.

USER: That's ok, no problem. Thank you for the information.

ASSISTANT: Thank you for contacting us.