You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Anna Hernandez.

ASSISTANT: What can I do for you today?

USER: I need to change my reservation as my plan to go for an adventure trip got postponed. Can you help me?

ASSISTANT: Sure, please wait for few minutes.

USER: Sure.

ASSISTANT: There is no existing reservation found on your name in our records.

USER: That's alright, thanks for your response.

ASSISTANT: Thank you for reaching us.