You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I assist you?

USER: I want to update my trip dates as my plan to visit The Karen park in Los Angeles got postponed. Please change the reservation made by the name Charles Green.

ASSISTANT: Sure, we are here to help you. Wait for some time.

USER: Sure, I will be waiting for your response.

ASSISTANT: There was no reservations found on your name.

USER: That's Ok. Thanks for your assistance.

ASSISTANT: Thanks for choosing us.