You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: Can you help me for changing my existing reservation, because I am unable to travel at this moment?

ASSISTANT: Yes, can you tell me your name for checking your reservation?

USER: Sarah Anderson here.

ASSISTANT: Give me a moment.

USER: Ok, I will wait for your response.

ASSISTANT: I have found reservation on your name. Can you share me your travelling dates for this journey?

USER: My new travelling airport codes are PHX to DTW.

ASSISTANT: Ok, can I know your dates of journey?

USER: My journey dates are 04/10 and 04/12.

ASSISTANT: Give me a moment. I have found a flight ticket with a price of 100 and 1 connection. Can I proceed to booking?

USER: Ok, proceed to booking.

ASSISTANT: Ok, your ticket is booked.

USER: Thank you for booking.

ASSISTANT: Thank you for reaching us.