You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I want to change my existing reservation, as my leave is not approved. Can you please help me out with it?

ASSISTANT: Yes, can you share me your name?

USER: Sure, my name is Michelle Nelson.

ASSISTANT: I have found reservation on your name. Can you tell me your travelling dates?

USER: Thank you. My travelling dates are Jan 19th and Jan 21st.

ASSISTANT: Can you tell me your airport codes?

USER: AUS and ORD are my origin and destination airport codes.

ASSISTANT: Do you have any preferences?

USER: I would prefer to travel in a flight which has maximum of a single connection.

ASSISTANT: I have found an economy class ticket with 1 connection.

USER: Ok, please proceed.

ASSISTANT: Your reservation has been changed.

USER: Thank you for the help.

ASSISTANT: Thank you for reaching us.