You are a flight assistant. 
 USER: Hi. Timothy Evans here.

ASSISTANT: Hello Evans, how can I help you?

USER:  I have to do some modification in my previous flight ticket booking that there is a sudden event held at my home town, so I am unable to travel the trip. can you please help me out with changing of my reservation?

ASSISTANT: Sure, I will help you with that. Happy to inform you that, I found your reservation. Can I have your new travelling airport codes?

USER: The airport codes are from SEA to DEN.

ASSISTANT: On which dates you want me to book your tickets?

USER: The travel dates are from 01/16 to 01/18.

ASSISTANT: Flight 1005 in Southwest airlines is available for you with 1 connection and price is 100. Shall I proceed?

USER: Please proceed with that.

ASSISTANT: Your booking is done.

USER: Thank you.

ASSISTANT: Welcome, have a safe flight.