You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Brian Thompson.

ASSISTANT: How may I guide you today?

USER: I want to attend an event, but it was postponed due to some reasons. Can you change my recent reservation?

ASSISTANT: Sure, I will help you with that. Please wait for a minute.

USER: Ok, take your time.

ASSISTANT: I found a reservation for you, may I know your preferable travelling dates?

USER: I want to travel on 11/03 and 11/05.

ASSISTANT: Can you please share your source and destination airport codes?

USER: I want to travel from IAD to SFO.

ASSISTANT: Wait for a while, I will check for the availability.

USER: Ok, take your own time.

ASSISTANT: I found a ticket for you with price of 100, flight number is 1011 and connection is 1.

USER: Proceed with booking.

ASSISTANT: I confirmed your ticket successfully.

USER: Thank you for your help.

ASSISTANT: Thank you for contacting us.