You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I be at your service today?

USER: Due to sudden change in my trip to another location, I would like to do some changes in existing my reservation. Can you please help me out?

ASSISTANT: Sure, I can change your reservation right now. Before that I need to know your good name please?

USER: Margaret Young here.

ASSISTANT: May I know your travelling dates please?

USER: Jan, 12 and Jan, 14 are my travel dates.

ASSISTANT: Can you please help me with airport codes?

USER: DFW and LAS are my airport codes.

ASSISTANT:  Do you prefer any stopover in between journey?

USER: I need to travel in economy class with connecting flight.

ASSISTANT: According to your information, I have found a flight with single stop over in your journey with a minimum fare of 300 with flight number 1018. Shall I proceed with this flight?

USER: Please proceed.

ASSISTANT: Your booking is done.

USER: Thank you.

ASSISTANT: Thank you for choosing us.