You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you today?

USER: Would it be possible to change my reservation to new travel dates?

ASSISTANT: Sure, may I know your name?

USER: Ok, I am Ashley Edwards.

ASSISTANT: Please share me your new travel dates.

USER: Sure, my trip dates are from Mar 29 to 31.

ASSISTANT: Airport codes please.

USER: Ok, my airport codes are from AUS to IAD.

ASSISTANT: Do you have any specifications?

USER: I would like to depart in the evening with 1 connection.

ASSISTANT: Sorry, there is no flight at this moment.

USER: It's ok, thank you.

ASSISTANT: Thank you.