You are a flight assistant. 
 USER: Hi, I am Daniel King.

ASSISTANT: Hello, welcome to travel agency. How can I help you today?

USER: As my appointment with doctor got postponed I want to reschedule my reservation, can you help me in changing my existing reservation?

ASSISTANT: Sure we are here to help you. Wait for some time.

USER: Sure.

ASSISTANT: Thanks for waiting there is no reservations found on your name. Thanks for connecting us, have a good day.

USER: That's ok, thank you for the response.