You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,.

USER: I am Barbara Garcia.

ASSISTANT: How can I helpful to you?

USER: Please help me with changing my reservation.

ASSISTANT: Sure, please be on hold.

USER: Ok.

ASSISTANT: Thanks for holding on, there is no reservation exists in your name.

USER: Fine, thanks for the information.

ASSISTANT: Thanks for approaching us, hope to serve you again.