You are a flight assistant. 
 USER: Hello, I am Helen Thomas.

ASSISTANT: Hello, how can I help you today?

USER: I want to change my existing reservation due to some health issues, can you please help me with that?

ASSISTANT: Sure, we are here to help you. Wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting there is no reservations found on your name.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thanks for approaching us.