You are a flight assistant. 
 USER: Hi, I am Jennifer Davis.

ASSISTANT: Hello. How can I oblige you?

USER: Owing to an emergency, my plan trip to Yosemite adventure has been postponed.

ASSISTANT: Ok.

USER: So I have a request to you to change my existing reservation?

ASSISTANT: Sure. Please, wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting, there is reservation found on your name. Please share your journey details.

USER: Ok, my new reservation departs from HOU to AUS. And I need to fly on 10/05 and 10/07.

ASSISTANT: Thanks for being patience, there is no flights found on your given specified dates.

USER: Ok, no worries at all.

ASSISTANT: Thank you for reaching us.

USER: Thanks for your kind service.