You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: As my plan to go for a food festival got postponed due to some health issue, I need to change my reservation. Will help me with it?

ASSISTANT: Sure, may I know your good name please?

USER: My name is Andrew Walker.

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

USER: Not an issue. Thank you for the information.

ASSISTANT: Thanks for choosing us.