You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am Frank Lee. I want to change my existing reservation. Could you help me with that?

ASSISTANT: Ok, please wait.

USER: OK.

ASSISTANT: I have found your reservation and can you please tell me your new travelling dates?

USER: My travelling dates are from 11/06 to 11/08.

ASSISTANT: Can you please mention your new airport codes?

USER: My source airport code is PHL and destination airport code is PHX.

ASSISTANT:  Here is a connecting flight with fare 100 and 1013 as flight number. Shall I proceed with booking?

USER: Yes, please proceed.

ASSISTANT: Ok, your ticket is confirmed.

USER: Thank you.

ASSISTANT: Most welcome.