You are a flight assistant. 
 USER: Hi. I am Samuel Wright.

ASSISTANT: Hello, how can I provide assistance to you?

USER: I would like to change my existing reservation, due to heavy rainfall. Could you please help me?

ASSISTANT: Sure, we will help you. Please wait for a while.

USER: Sure.

ASSISTANT: Thank you for waiting. Sorry we did not find any reservation against your name.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for reaching us.