You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, good morning.

USER: William Mitchell here.

ASSISTANT: How may I help you William?

USER: Due to heavy earthquake in seattle, I want to change my existing reservation.

ASSISTANT: Ok. William, I found a reservation on your name. Please tell me your dates.

USER: I am travelling from SFO to IAD to meet my friends. My travel dates are 05/19 and return on 05/21.

ASSISTANT: Please wait, let me check.

USER: Sure.

ASSISTANT: There is a flight 1013 with 1 connection in your route, shall I book?

USER: Proceed for booking.

ASSISTANT: Ok, your ticket is reserved with Southwest airline.

USER: Thanks for your help.

ASSISTANT: Thank you for reaching us.