You are a flight assistant. 
 USER: Hello, I am Ashley Garcia.

ASSISTANT: Hello. How can I aid you?

USER: Will you please help me in changing an existing reservation with my name, as my trip to visit my friend's house got preponed.

ASSISTANT: Sure. Please wait for a minute.

USER: Ok.

ASSISTANT: Sorry, there is no reservation available with your name.

USER: No problem. Thank you.

ASSISTANT: Thank you for reaching us.