You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Myself Thomas Brown.

ASSISTANT: Nice to meet you Brown.

USER: I want to spent more days with my family, so I want to change my existing reservation.

ASSISTANT: Ok, hold on for a moment please.

USER: Sure.

ASSISTANT: I found a reservation, can I know your new journey details please?

USER: Sure, my airport codes are from IAD to LAS.

ASSISTANT: Can I know your journey dates please?

USER: My trip dates are from 05/05 to 05/07.

ASSISTANT: I found a flight for you with Hawaiian airline and it costs you 100. Shall I proceed?

USER: Ok, please proceed.

ASSISTANT: Your ticket has been booked.

USER: Thank you for your help.

ASSISTANT: Thank you for choosing us. Have a safe flight.