You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I need to change my reservation as my get together program got postponed. Can you help me?

ASSISTANT: May I know your name please?

USER: I am Samantha Parker.

ASSISTANT: There is a reservation on your name, please share your desired travel dates.

USER: I would start on June 30th and return on July 2nd.

ASSISTANT: May I know your preferred airport codes?

USER: My origin is SFO and destination is EWR.

ASSISTANT: Sorry to say, there is no flight on your desired travel dates.

USER: That's alright, thanks for your assistance.

ASSISTANT: Thank you for opting us.