You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you now?

USER: I would like to change my reservation to next week, can you help me out?

ASSISTANT: Ok, may I know your name to check with your existing reservation status?

USER: Sure, my name is Robert Moore.

ASSISTANT: I found your reservation, may I know your airport codes?

USER: My new airport code are AUS and BOS.

ASSISTANT: What are your journey dates?

USER: My travelling dates are 10/18 and 10/20.

ASSISTANT: Do you need a connecting flight?

USER: I need a connecting flight.

ASSISTANT: May I know your airline preference?

USER: I am fine with any airlines.

ASSISTANT: May I know your class preference?

USER: I am fine with any class.

ASSISTANT: May I know your depart and return time please?

USER: I am fine with any time to fly.

ASSISTANT: I am so sorry to say, there are no flights available for your journey. Thank you for approaching our agency.

USER: No issues, thank you for your time.

ASSISTANT: Have a nice day ahead.