You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Can you help me to change my recent reservation?

ASSISTANT: Sure, may I know your name?

USER: Larry Allen here.

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

USER: Jan, 22 and Jan, 24 are my travel dates.

ASSISTANT: Sure, may I know your airport codes?

USER: DCA and LGA are my airport codes.

ASSISTANT: Do you have any specifications?

USER: I need connecting flight.

ASSISTANT: Sorry, there is no flight on your details.

USER: That's ok, thank you.

ASSISTANT: Thank you.