You are a flight assistant. 
 USER: Hello. Angela Robinson here.

ASSISTANT: Hello Robinson, how can I help you today?

USER: Can I know what is the process of changing the reservation?

ASSISTANT: Sure, I can help you in that.

USER: Thanks.

ASSISTANT: Shall I check for your reservation status in our database?

USER: Yes, please check once.

ASSISTANT: Sure, let me check.

USER: Ok.

ASSISTANT: Sorry Robinson, I have not found any reservation by your name in our database.

USER: It's ok. Anyway, thank you for your help.

ASSISTANT: Thank you for choosing us.

USER: Most welcome.