You are a flight assistant. 
 USER: Hello.

ASSISTANT: Please let me know, what kind of service your looking for?

USER: I want to change my reservation, due to heavy rainfall in Seattle, can you help me?

ASSISTANT: Sure, please share me your airport codes.

USER: I am departing from LAS and want to land in IAD.

ASSISTANT: May I know your travel dates?

USER: My departure date is on Aug 02 and return on Aug 04.

ASSISTANT: Is there any class preferences for you?

USER: I am ok with any class.

ASSISTANT: Do you need direct flight or connecting flight?

USER: I need a connecting flight.

ASSISTANT:  For booking, we need your good name. Please mention it.

USER: My name is Gary Moore.

ASSISTANT: May I know your airlines preferences?

USER: I am ok with any airlines.

ASSISTANT: We found a Southwest airline and 1008 is flight number with a fare of 200. Shall I proceed?

USER: Please proceed for booking.

ASSISTANT: Your ticket is confirmed with an economy class.

USER: Thank you for your help.

ASSISTANT: Thank you for opting us.