You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I want to change my existing reservation, due to some health issue. Can you help me?

ASSISTANT: Sure, I am here to help you. May I know your name please?

USER: Thank you, I am Alexander Perez.

ASSISTANT: Please hold on a moment.

USER: Sure, take your time.

ASSISTANT: Alexander Perez, I have found your reservation. Please help me with your airport codes.

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

ASSISTANT: May I know your planned travel dates please?

USER: Ok, my travelling dates are on Nov 18 and return on Nov 20.

ASSISTANT: Do you need a connecting flight?

USER: I need a single connecting flight.

ASSISTANT: May I know your other specifications?

USER: I want a normal cost flight.

ASSISTANT: I found an economy class in Hawaiian airlines with fare 200 and it has single connection. Can I book your ticket?

USER: Ok, you can proceed with the ticket booking.

ASSISTANT: Ok, your booking is confirmed with flight number 1022.

USER: Thank you for your help.

ASSISTANT: Thank you for reaching us.