You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you today?

USER: My name is Scott Collins, I want to change my existing reservation due to health issues.

ASSISTANT: Sure, I will help you in changing. There is a reservation in our data list, so could you please help me with your new travelling dates?

USER: My departure day is 12/06, return day is 12/08.

ASSISTANT: May I know your travelling airport codes?

USER: My source and destination airport codes are AZ - PHX, TX - DFW.

ASSISTANT: There is a Spirit 1001 airline with fare of 200 which matches your travelling dates. Shall I proceed with booking?

USER: You can proceed to booking, if it is a connecting flight.

ASSISTANT: Your booking has been confirmed on name of Scott Collins.

USER: Thank you.

ASSISTANT: Thank you for approaching us.