You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

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

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Can I know your name, to check the status of your reservation?

USER: Please check the reservation with the name Anthony Johnson.

ASSISTANT: Ok, please wait for a minute. I will check your reservation status and get back to you.

USER: Sure.

ASSISTANT: We are happy to say that, we have found a reservation on your name. Please, share me your airport codes.

USER: My airport codes will be from  AUS to PHL.

ASSISTANT: Can you share me your travelling dates?

USER: I want to start my journey on Jan 4th and I would like to return on Jan 6th.

ASSISTANT: Let me know your connection limit for your journey.

USER: I prefer a connecting flight.

ASSISTANT: May I know your class preference?

USER: I am fine with any class flight.

ASSISTANT: Do you have any preference regarding airlines?

USER: No, I am fine with any airlines.

ASSISTANT: Let me know your depart and arrival timings.

USER: I am flexible with any time.

ASSISTANT: Ok, please wait for a moment.

USER: Ok.

ASSISTANT: Sorry for the inconvenience, there are no flights found on your desired routes.

USER: No problem, thank you.

ASSISTANT: Thank you for reaching us.