You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. Can you please tell me how may I aid you?

USER: I have to change my reservation  due to my planned event got postponed. So please help me with that.

ASSISTANT: Sure, I will definitely help you to change the details of your previous ticket. Can I know your name please?

USER: Thank you. Please check the reservation with my name Raymond Green.

ASSISTANT: Ok, please be on hold for a minute.

USER: Sure, I will wait for your response.

ASSISTANT: I regret to tell you that, there is no active reservation found with your name to change the details.

USER: Oh! It may not be booked properly due to server issues while booking. Anyway, thank you for your time.

ASSISTANT: It's my pleasure to help you. Thank you for choosing us.

USER: Most welcome.