You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, do you need any help from us?

USER: I want to change my recent reservation as my meeting is postponed to Houston. Can you please help me?

ASSISTANT: Sure, I am glad to help you. I found your reservation, can you please tell me your trip dates?

USER: Sure, my trip dates are May 2 and May 4.

ASSISTANT: Ok, may I know your location airport codes?

USER: My airport codes are ORD and IAH.

ASSISTANT: Ok, could I have your name please?

USER: Larry Lewis here.

ASSISTANT: Ok, do you need direct or connecting flight?

USER: I prefer connecting flight.

ASSISTANT: The economy class with flight number 1001 of Delta airline is available having fare as 100 and connection as 1, is it ok for you?

USER: Yes, I am happy with this flight. Ensure to check for economy class.

ASSISTANT: Ok, your reservation is confirmed. The departure time is 21:00 PM and the arrival time is 9:00 AM.

USER: Thank you for booking my ticket. You are so helpful.

ASSISTANT: You are welcome.