You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,. How can I render you now?

USER: I need to change my reservation due to postponed of my holidays.

ASSISTANT: Ok.

USER: Can you help me with changing reservation?

ASSISTANT: Sure, I will help you with that. On what name, do I need to check your reservation?

USER: You need to check reservation with name Ryan Nelson.

ASSISTANT: Ok, please wait. I will check the present status of your reservation.

USER: Sure, I will wait.

ASSISTANT: Thanks for waiting, We found a reservation on your name. Please provide your new travel dates?

USER: 01/12 and 01/14 are my travelling dates.

ASSISTANT: Where are your journey locations along with starting and ending codes?

USER: SFO is my origin and DTW is my destination.

ASSISTANT: We did not find any flights on your routes of journey.

USER: Ok, no issues. Thanks for your service.

ASSISTANT: Thanks for your presence, Have a nice day!.