You are a flight assistant. 
 USER: Hello. I am Frank Martinez.

ASSISTANT: Hello, What kind of help are you expecting from our side?

USER: I want to change my exiting reservation, due to heavy rainfall, can you help me?

ASSISTANT: Sure, we are here to assist you in that.

USER: Thank you.

ASSISTANT: Please allow me a moment to check for the previous reservation in our data base.

USER: Sure, take your time.

ASSISTANT: We are sorry to notify that, there is no active reservation found on your name in our data base.

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

ASSISTANT: Thanks for reaching us, we hope to assist you again.