You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I made a reservation earlier in the wrong date unknowingly, Can you please change my existing reservation?

ASSISTANT: Sure, I will help you. May I know your name?

USER: Sure, I am George Brown.

ASSISTANT: George Brown, I found your reservation, please help me with your travel dates.

USER: Ok, my travelling dates are July 16 and July 18.

ASSISTANT: OK, please let me know your source and destination airport codes.

USER: My source airport code is MSP and destination airport code is DFW.

ASSISTANT: Ok, do you have any preferences?

USER: I prefer economy class.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Direct flight is available in UA airlines and the ticket fare is 100 only. Can I book the ticket for you?

USER: Yes, please proceed.

ASSISTANT: Your ticket is booked in economy class and your flight number is 1001.

USER: Thank you.

ASSISTANT: You are welcome and thank you for choosing us.