You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Rebbeca Wright, help me to change my reservation as my plan to visit my uncle house is postponed. Can you change my reservation?

ASSISTANT: Sure, please wait a minute.

USER: Sure.

ASSISTANT: We found a your reservation, could you help me with your travelling dates?

USER: I will fly on 09/10 and I will return on 09/12.

ASSISTANT: From where are you going to board and land at?

USER: I like to travel from PA-PHL to NC-CLT.

ASSISTANT: There are no flight available on your journey dates.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for opting us.