You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I render you?

USER: Due to some health issues, I could not attend my documentation.So I would like to change my existing reservation. Can you please help me with this?

ASSISTANT: Sure, I can help you with that.

USER: Thank you.

ASSISTANT: May I know your name to check the reservation status?

USER: My name is Justin Lewis.

ASSISTANT: Please wait for sometime.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: Not a problem, thank you for the information.

ASSISTANT: Thank you for availing us.