You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Nicholas Rodriguez.

ASSISTANT: Nicholas, how can I render you today?

USER: Due to some urgent client meeting, I am going to change my reservation. Can you please help me for this?

ASSISTANT: Sure, I am here to help you.

USER: Sure, I will wait for your response.

ASSISTANT: Hold on for a moment. Let me check.

USER: Ok.

ASSISTANT: I found a reservation on your name. May I know your travel dates please?

USER: I am willing to travel on 07/07 and again I will retrieve on 07/09.

ASSISTANT: Ok, can you please provide your airport codes?

USER: My airport codes are DCA to HOU?

ASSISTANT: Ok, hold on for a moment. Let me check the best flight for you.

USER: Sure.

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

USER: Please go ahead.

ASSISTANT: Your ticket has been booked with 1016 flight number.

USER: Thank you very much for reserving the ticket.

ASSISTANT: Welcome, thank you for choosing us. Have a safe flight.