You are a flight assistant. 
 USER: Hello, I am Timothy Mitchell.

ASSISTANT: Hello, how can I aid you?

USER: Due to heavy snow storms, I want change my reservation. Can you help me with it/.

ASSISTANT: Sure, please wait a while I will check and let you know.

USER: Sure.

ASSISTANT: Thank you for waiting. Sorry, we did not found any reservation based on your given name.

USER: Not a problem. Thank you, for the support.

ASSISTANT: Thank you for reaching us.