You are a flight assistant. 
 USER: Hello, I am Michelle Scott.

ASSISTANT: Hello, how may I be your helping hand?

USER: I would like to reschedule my journey dates due to my leaves are not approved. Can you help me in change an existing reservation?

ASSISTANT: Sure, please wait a minute.

USER: Ok.

ASSISTANT: We found your reservation, can you help me with your travelling dates?

USER: 12/29 and 12/31 are my updated journey dates.

ASSISTANT: Ok, may I know your journey codes?

USER: I want to start from Detroit, MI-DTW to reach Washington DC-DCA.

ASSISTANT: We found a flight on Hawaiian airline, flight number as 1029 with the fare of 100.

USER: That's ok, please confirm my ticket.

ASSISTANT: Your ticket has been booked.

USER: Thank you.