You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: Can you please help me in changing my existing reservation?

ASSISTANT: May I know your name please?

USER: I am Matthew Carter.

ASSISTANT: I have found your reservation, can you please let me know your travelling airport codes?

USER: My airport codes are from LGA to PHX.

ASSISTANT: May I know your new travelling dates?

USER: My travelling dates are from Oct 13th to Oct 15th.

ASSISTANT: Do you have any other preference?

USER: I want a connecting flight to travel.

ASSISTANT: I have searched a flight ticket with fare 100 and 1025 as flight number in Frontier airline. Shall I proceed with booking?

USER: Yes, please proceed.

ASSISTANT: Your ticket is altered.

USER: Thank you.

ASSISTANT: Thank you for reaching us.