You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you today?

USER: I want to change my existing reservation which is done recently due to some health issues, can you please help me in this?

ASSISTANT: Sure, may I know your name please?

USER: Sure, my name is Nancy Hill.

ASSISTANT: Please wait for a moment.

USER: Sure, I will wait.

ASSISTANT: There is reservation found as per your name.Please share your recent travelling dates.

USER: Sure, my planned dates of journey are from Mar, 29 to Mar, 31.

ASSISTANT: May I know your recent travelling airport codes please?

USER: Ok, my airport codes are from DCA to DEN.

ASSISTANT: If you have any specifications please let me know, I'll check availability according to that?

USER: No, I do not want any other specifications.

ASSISTANT: Hawaiian airline is providing a connecting flight of fare 100 with economy class, shall I proceed for booking?

USER: Ok, you can book it.

ASSISTANT: Your ticket has been confirmed with flight number 1004.

USER: Thank you for your service.

ASSISTANT: Thank you for reaching us with a query.