You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How could I aid you today?

USER: I am Gregory Campbell. I want to change my reservation due to health problem, can you help me?

ASSISTANT: Please give me a moment.

USER: Sure.

ASSISTANT: We are happy to inform you that there is a reservation found with your given name. Can you please share me your journey locations?

USER: My airport codes are from DCA to JFK.

ASSISTANT: When you are willing to travel?

USER: My travel dates are 08/07 and 08/09.

ASSISTANT: We are glad to inform you that there is a flight available with an airline Hawaiian of flight 1017 and price is 100. Shall I proceed?

USER: You can proceed.

ASSISTANT: Your ticket has been confirmed.

USER: Thank you for your help.

ASSISTANT: Thank you for choosing us.