You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you today?

USER: I would like to change my existing reservation which was made on the name of Samuel Garcia. Can you help me with it?

ASSISTANT: Sure, we are glad to help you. Please wait for a minute.

USER: Ok.

ASSISTANT: Thanks for waiting, no reservation found on the name of Samuel Garcia.

USER: Ok, thank you.

ASSISTANT: Thank you for reaching us.