You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Larry Miller.

ASSISTANT: How can I support you today?

USER: I am planning to change my reservation to another destination, so can you help me to change my reservation?

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: There is no reservation found with your given name in our data.

USER: That's ok, thank for your information.

ASSISTANT: Thank you for choosing us.