You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. May I know your name please?

USER: My name is Deborah Adams.

ASSISTANT: How may I aid you?

USER: I need to change my existing reservation as my meeting with my client got postponed.

ASSISTANT: Sure, give me some time I will check and let you know.

USER: Ok.

ASSISTANT: Thanks for waiting, we didn't found any reservation by this name.

USER: Thank you for the information.

ASSISTANT: Thanks for opting us.