You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

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 with a typhoid fever, so I am unable to travel the trip and my son is busy in his office work. Can you please help me in changing my flight ticket?

ASSISTANT: Sure, we will help you with that.

USER: Thank you for your concern.

ASSISTANT: Can you please help me with your name to check the reservation?

USER: Sure, my son had done my reservation with my name Elizabeth Mitchell.

ASSISTANT: Please wait a moment, I will check your reservation and get back to you.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry to say that there is no reservation found on your name to change.

USER: Oh! It might be cancelled by my son but he did not informed me yet. Anyways thank you for the information.

ASSISTANT: Thank you for reaching us, hope to serve you next time.