You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I want to change my reservation, can you please help me?

ASSISTANT: Sure, may I know your name?

USER: My name is Patrick Williams.

ASSISTANT: Ok, please wait a minute.

USER: Sure.

ASSISTANT: We found a reservation on your name, can you please share your travel dates?

USER: My travelling dates are on Nov 24 and Nov 26.

ASSISTANT: May I know your airport codes?

USER: My source and destination are AUS and OAK.

ASSISTANT: Do you have any specifications?

USER: I need to return in the afternoon time. I prefer a connecting flight.

ASSISTANT: Sorry, there were no flights found on your route.

USER: Ok, not a problem. Thank you.

ASSISTANT: Thank you.