You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: My name is Donald Hernandez. I need to change my existing reservation as my sister is blessed with a baby before the expected delivery date. Could you help me in changing the reservation?

ASSISTANT: Please wait a while. There is no reservation on your name.

USER: That's ok. Thank you for your time.

ASSISTANT: Thanks for reaching us.