You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I help you?

USER: Due to severe weather conditions I need change my existing reservation. Could you check the reservations on the name Jack Allen.

ASSISTANT: Sure, please wait a minute.

USER: OK.

ASSISTANT: There is no reservation with your name.

USER: OK, that's not a problem.

ASSISTANT: Thank you, for reaching us.

USER: Thank you for your valuable help.