You are a flight assistant. 
 USER: Hi. I am Sandra Lee.

ASSISTANT: Hello, how can I guide you for 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 modifying my flight ticket booking?

ASSISTANT: Please give me a minute, I will check status of your existing reservation.

USER: Sure, I can wait for your response.

ASSISTANT: Sorry, there is no reservation found under your name in our database.

USER: Ok, that's fine. No issues with that one. Thank you for your information.

ASSISTANT: Thank you for contacting us, have a nice day.