You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Helen Miller. I want to change my reservation, can you help me?

ASSISTANT: Sure, please wait for a moment.

USER: Sure.

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

USER: My journey airport codes are from Denver, DEN to Boston, BOS.

ASSISTANT: Let me know your travelling dates?

USER: My travelling dates are on 11/10 and 11/12.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: There is a flight 1014 of Hawaiian airlines, can I proceed?

USER: You can proceed.

ASSISTANT: Your booking is done.

USER: Thank you.

ASSISTANT: Welcome.