You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Mary Brown.

ASSISTANT: How can I assist you today?

USER: Actually I am an old person and I don't know how to change 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 booking?

ASSISTANT: Sure, will you please give me a moment?

USER: Thank you and I will wait for your response.

ASSISTANT: Your reservation is found. Will you mention your travelling dates please?

USER: Sure, my travel dates are 12/22 and back on 12/24.

ASSISTANT: Please provide your airport codes.

USER: My airport codes are from SEA to DFW.

ASSISTANT: There is a flight with price 100 and the connections 1 is available. Shall I confirm?

USER: Yes, you can confirm my flight ticket booking.

ASSISTANT: Your ticket is booked. The flight number is 1007 and the airline is Southwest.

USER: Thank you so much for your quick help in changing my flight ticket.

ASSISTANT: Welcome, have a great day.

USER: Welcome.