You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I need to change my existing reservation as my sister blessed with a baby before the expected delivery date.

ASSISTANT: How can I be of service to you?

USER: Can you help me out with that?

ASSISTANT: Sure, give me a minute. Can you please provide me with your name?

USER: My name is Kimberly King.

ASSISTANT: Sorry to sat that there is no reservation found.

USER: That's fine, thank you for your help.

ASSISTANT: Thank you for providing me with your details.

USER: You are welcome.