You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I aid you today?

USER: Help me in modifying my recent reservation, which is reserved earlier on my name. Can you help me?

ASSISTANT: Sure, please wait for a while.

USER: Ok, thanks for responding. I will wait for your response.

ASSISTANT: May I know your name?

USER: I am Sandra Hernandez.

ASSISTANT: Sorry, no reservation found on your name Sandra.

USER: Oh! I think it was not reserved here. I will check on another airlines. Thank for the prompt service.

ASSISTANT: Sure, thank you for approaching us.