You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Is this a flight ticket booking agency?

ASSISTANT: Yes, welcome to our agency. How can I assist you today?

USER: Due to severe health issue, I am not able to travel in a flight, so  I would like to change my reservation to another date. Can you please help me out with that?

ASSISTANT: Sure, I can help you with that.

USER: Thank you.

ASSISTANT: Please provide your name for checking the reservation.

USER: Sure, my name is Scott Taylor.

ASSISTANT: Please give me a moment.

USER: Sure, take your time.

ASSISTANT: Thank you for waiting. There is no reservation is found under your name.

USER: Oh, so sad to hear. Anyways, thank you for the information.

ASSISTANT: Welcome, have a great day.