You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, what can I do for you today?

USER: Can you please help me in changing my existing reservation?

ASSISTANT: Sure, can you mention your name please?

USER: I am Frank Edwards.

ASSISTANT: Please wait.

USER: Ok.

ASSISTANT: Sorry, no reservation found on your name in our portal to change it.

USER: No issues, thank you.

ASSISTANT: Thank you for contacting us.