You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I am Jeffrey Miller. I need to change my reservation as my meeting got postponed, can you please help me out?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Please, wait a minute.

USER: Ok.

ASSISTANT: Thank you for waiting, we found a reservation on your name. Can you please share your updated journey dates?

USER: Ok. My travel dates are from Apr 05 to Apr 07.

ASSISTANT: Let me know your take off and landing airport codes.

USER: My airport codes are from IAH to SFO.

ASSISTANT: Give me a minute, I will let you know the flight availability.

USER: Ok.

ASSISTANT: Thank you for waiting, there is a flight available with fare 400 in business class having single connection.

USER: You can proceed.

ASSISTANT: May I confirm this flight of UA airline?

USER: Yes.

ASSISTANT: Ok, your reservation has been confirmed with flight number 1019.

USER: Thank you.

ASSISTANT: Thank you for choosing us.