You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you today?

USER: I want to change my existing reservation which is done recently due to some problems, can you please help me in this?

ASSISTANT: Sure, may I know your name for the changing process?

USER: Sure, my name is Mark Anderson.

ASSISTANT: Your change reservation is found. Can you provide your new travelling dates?

USER: Ok, my planned dates of journey are from May, 03 to May, 05.

ASSISTANT: May I know your planned airport codes please?

USER: Sure, my airport codes are from LGA to CLT.

ASSISTANT: Do you have any limits on number of connections?

USER: Yes, I need a connecting flight.

ASSISTANT: Do you have any another specifications on your journey?

USER: No.

ASSISTANT: United Airlines providing a flight with the price 100 with single connection. Can I proceed for the booking?

USER: Ok, you can change it.

ASSISTANT: Your flight ticket reservation changed with the flight number 1009.

USER: Thank you for your help in changing my ticket.

ASSISTANT: Welcome, thank you for reaching us.