You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, do you need any help from us?

USER: Actually I am an old person and I don't know how to modify a flight ticket that is booked by my son in the last week but suddenly I got admitted in hospital due to some health issue, so I am unable to travel the trip. Can you please help me in changing my flight ticket?

ASSISTANT: I understand your request and happy to help you. Could I have your name please?

USER: Thanks a lot for your quick response. My name is Jack Walker.

ASSISTANT: Walker, there is no reservation matching with your name to make changes further.

USER: Oh! It is so sad to hear from your end. I will reach some other agency to do the changes. Anyways, thank you for checking.

ASSISTANT: My pleasure. If any other questions arise, please feel free to contact us at any time.